Does it look shady to register a domain then turn around the next day and try to sell it to a business, saying, " I bought but don't have the time to develop it." I bought a .net last night that expired yesterday and there is a really successful coupon site that owns the .com. And they own a bunch of domains that redirect to one site. Any advice?
You bought the .net of a developed .com.... it will come across that you are trying to "extort" money from the person , and this can lead to legal issues, depending on the name-if it's generic or not. Then saying that you wanted to develop it, etc-may hurt you as well. And when did you decide this? A few hours after reg'ing it?
But apart from your situation, it's actually not being being truthful. If you really did intend on developing, and then said that... sure. But even in such a case, I would just refrain from saying it.
The less you say, the better.
Now let's say the person approaches you, and you really do have intentions to develop it, then you can mention it. But if at that point of contact, you do not have any intentions to develop, don't say it. Because you know it's not true, and when you send that message to that person, you are also sending some "energy" with it. And that energy stems from dishonesty... and that can't be good.
Keep it truthful, short, and simple.
But in your case, I don't know if contacting the person is such a good idea... I mean you are trying to sell a .net to the .com owner. He probably will not want it.