While I'm way below the post count, I was going to vote for it. But then I thought, sure, it prevents a lot of the "drive-buy" people, but who does it help by keeping them out. The person selling them here has less people to sell to, and limiting post count before you can sell means there's less things to buy. Should just state in the rules "Sellers are free to refuse sales to anyone they wish, and are encouraged to not sell to people with under 100 posts".
Personally, I think before anyone's allowed to buy any US HuCards\TurboChips, they have to buy one CD-Rom or import. I'll freely admit I'm not a collectard hater, but people who say "I have a complete TG-16 library" when they don't have a single CD-rom or import piss me off; you're ignoring the bulk of the good games. Course 90% of those people can only name bonk, zonk, blazing lasers, and magical chase; maybe Ys too. But I'm biased too and been playing imports for years thanks to DieHard Gamefan getting me addicted.