Oh premium members can have 3 links I didn't know that So I have only one parked domain name in signature.
As I said, I really have no clue... So if you get an infraction, don't blame it on me. It's best if you check the FAQ or ask Shaw (digitalpoint) himself.
Your domain name will be banned by the parking company. Don't ever do that. Read their TOS first - 99.9% of them will say "only type-in or search engine traffic"
Yes, it depends how it is parked. If you use a parking service which puts up PPC ads their TOS usually prohibits promotion of the site in any way. But if you think your site will get traffic by doing some promotion, then why don't you set up your own parked page? Even a 1-click wordpress install can offer a lot options quickly and cheaply.