I think it is no problem, while u put BIN, u actually give the opportunity to everyone to own that name, it is buyers decision, buy it now(imm.secure the name) or take any risk(like the name been bought by others, like the seller raise the price, like the seller put it unsale...)....of course u also taking risk, u may lost the chance to sell it to this buyer...
This is very true.
From my own experience as an end-user (Buyer):
I always weigh this when I'm buying a domain as an end-user. I recently purchased Super//Premiums//com from hugedomains for $3,200. I didn't want to pay this much, but I did a lot of research and found from others that hugedomains rarely gives discounts, and in some cases will raise the price of the domain once interest is shown and they do more research. So I just chose the "Buy Now" option, because the last thing I wanted was them looking up my ultra//premiums//com site or seeing other similarly named sites that were developed by others including super//premium//com.
When I bought Ultra//Premiums//com the prior year, it was a similar, but totally different story. The domain was listed on Sedo with a Buy Now of $915. I took the Buy Now as soon as I could because it looked to be under priced, at least for my own valuation. I could have tried to negotiate it down to $600 or $700, but in my opinion that would be stupid. Risking the purchase to save a couple hundred dollars didn't make sense.
I think it comes down to 2 very distinct absolutes in the domain negotiation process:
- As a Seller - If a buyer purchased it via BIN, then you (as the seller) ethically need to follow through with the sale if they pay for the domain in a reasonable amount of time. (If it's been a week, and they are potentially trying to sell it without actually making any payments to you first, then that would be my only exception.)
- As a Buyer - If you (as the buyer) make an offer instead of taking the BIN option, you have essentially made a counter-offer, and you are risking your ability to purchase at that BIN price. As a buyer, you need to realize that the seller can counter offer, raise the price, or no longer list the domain for sale. Nothing is guaranteed once you start negotiating and before any offer is accepted. As a buyer, I've had several deals that don't happen even after a BIN. A seller can simply have too much sentimental attachment, just like if they were selling their first car. You never know...
Many of the opinions on this thread (including mine), focus on the fact that it will look bad, or the buyer will take offense if you raise the BIN price or retract it. Guess what? They will for sure. So you need to make the decision whether you are going to follow through with the gut wrenching sale, or increase the price to what it's worth at today's valuation. You'll either lose the sale (most likely), or find out how much the buyer really wants the domain.
Examples
Look at it this way. Let's say you had an old 1968 Ford Bronco parked outside with a "for sale" sign on it for the last 10 years with a price of $6,000. In the last 10 years, the value on these vehicles went from $6,000 to $20,000. If a buyer knowingly comes to you negotiating off the $6,000 price, when they know that the value to them (and the market) is closer to $20,000, are you really going to feel bad for this person? Domains are usually the same. In my buying scenarios above, I fully knew what the domains were worth to me because of my plans for them. So don't feel bad for me if I make a stupid move and try to undercut your already low price. Trust me, these buyer's are not worrying about you when they give you 1/5 of the domain's value.
For me, this happens 1-2 times per year where a domain is under-priced and I disengage when an offer is received (usually low-ball) and subsequently I increase the price. Up until last year, I would more often get the gut-wrenching "Buy Now" sale where I underpriced a domain 5-10 times a year. But I've since fixed this for most of my domains now by updating the prices more regularly.
My most recent example of a similar scenario was this year when I received an email in April asking about the price on one of my brandable domains. I looked at the domain, and it had a BIN of $7,450 on the landing page. I did some research and found that there were at least 3 companies now using this brandable name for their business. So, not knowing if person inquiring ever saw my landing page, I updated the price to $24,500 and sent them a reply. I knew that if they had previously saw the price, there was a 90% chance the sale was dead. That was fine with me. Three weeks later I received an offer of $5,000 from a different email address. I said we needed to stick close to the asking price on the domain, and they came back at $10,000 within 4 hours. Negotiations stalled and I came back at $15,000. We closed at this price 3 months later in August. The company wasn't even 1 of the 3 companies currently using the name. It was a new 4th company that was running under under the same brandable domain in a different industry.
Summary
So, in my opinion as long as an agreement hasn't been reached, you can do whatever you want. But to avoid this, I just try to keep my prices updated more regularly.
If you feel more speculative on the future of a particular domain, overprice it. If you price it at $25,000 instead of $2,500 you're still likely to get an offer from a serious buyer and you can evaluate the value at that time. But if you start with a BIN of $2,500 on your favorite domains, you'll rarely get more than that $2,500.