What % of players seeing the flop, constitutes a tight table?

[NabO]

That depends of the stake.. If you want to play 1/2 no doubt 30% is not that good but you can be happy if you find a 15-30 game with that percentage every day. 5 weak players ( or very weak) is a good way to make some money playing low/mid limit but 1 or 2 weak players in higher limits give you a lot of money.

ps: You can find a very good article on that subject wrote by Lou Krieger in the cardplayer archives.