Not definitive but 100 posts is across the board and 50 posts for I think it was either a year or two and then you can PM one of the mods (probably best to make it an admin/supervisor too). Exceptions are probably only for those with a longstanding IRC presence or with some other big contributions to the site in general.
An "old member" is a relative term, usually I think of old members as those who knew about GBAtemp before we actually became GBAtemp. If you have no idea what I'm talking about, then you're not considered an old member.
Fact: We used to have ROMs, no seriously, we did.
However, there are only a few members that date so far back. Thus, I would also consider people who were at GBAtemp before the site redesign (before Jan 2005) to be old members as well.
i always do hours of research before i buy anything because half the crap you see gets bad reviews especially when it's on sale, stuff is usually on sale because it was a bad deal at full price and nobody was buying it