I think all trackers should have random open signups. This would help with many things not to mention the selling of invites. Simply because everyone would actually stand a chance to get in.
Reasons I hear for why no open signup.
"security." we need to allow only trusted members in. so we let our members invite their trusted friends. Don't get me wrong there are people on the internet that exist who can be trusted. But they are far and few between. To wager your ftn or bitmetv account on trust that the person you invited won't screw you over, is like screwing a whore and hoping not to get an std.
"But then anyone could get in maybe even the riaa!!!" I like that one the most I think. I'd be more concerned of someone with a lightening speed internet connection with a seedbox that's actually working the forums than I would some random person trying to sign up on the site. So really even GIVING away invites in forums is a MAJOR security risk and even mentioning the sites name. (even like FT* or sc*)
Could it be that some sites don't want open signups because they like feeding a fire for the people addicted to getting the best. For some reason people are confused in a site being the best because it's hard to get into. Not comparing how easy it is to seed there or it's pre-times. Rarity seems to be the only thing that distinguishes one site from another. That is after it's established a name for it's self of course first.
What do you think?