Most domain parking companies do not allow you to get links to your parked domains, but some do. Yes, I have been doing this for over 5 years and the parking companies that I work with have told me that getting normal links to parked domain is allowed, because you are not making people click or trying to trick them into clicking. A link to a parked domain about electric cars that says something like "Electric Cars" is no problem for the places I park with. And that is how it SHOULD be for all parking companies. Most of my domains get little type-in traffic so getting links is my best option.
But you can't SEO parked pages because they have no contents.
This is not exactly true at most domain parking companies. Almost all allow you to edit your page title, description meta tag, and keywords meta tag. This is a BIG part of basic SEO. But of course the page content is also very important and a page without any real content beyond menus and ads is generally not going to do very well. Unless of course it has many good links going to it.
But some parking providers also let you add content to your parked domain, and some even allow you to add extra pages of content as well. These parked domains cannot be expected to do as well as a regular web site because the search engines mostly know when domains are parked and when they are not.
But since Google puts their ads on parked domains, they are telling us all that parked domains HAVE a useful purpose in helping visitors find the information and products they are looking for.
Parking can still work, but my portfolio has gone from making as much as $1,800 om a single month to now only making about $30 a month. So here is my advice to those that want to park:
-
Ask the parking companies if you can get links and what is allowed and what is not. Follow their rules and you will make some money if you don't get greedy.
-
If a domain is getting traffic and no clicks, optimize it. Keep trying until you find out what your traffic is looking for.
-
If a domain is getting clicks but not earning anything, try changing the keywords to trigger different ads. If that doesn't work, move the domain to another provider. Keep trying ones with different feeds (Yahoo/Google) until you find one that pays something you can live with.
-
If a domain does not earn reg fee in 1 year, get rid of it. Unless of course you are "sure" it has potential to sell for good money. But treat your domaining as a "business". You can just go around buying this domain and that domain with no real idea who might buy them and for how much, just hoping that you have been smart and clever.
Maybe some people can do that and make money, but I have not been able to. The few sales I get each year are because I have some odd domain that someone got the idea they needed. But selling a domain for as much as $5,000 is not that great when you pay more than $9,000 a year in reg fees!

Look at the big picture for your domain business and you will avoid many of the mistakes that most of us have made in the past. Or just have a good time domaining, it's up to you.