I don't think that they contain any more weak players than a regular speed table would. About the only reason I would say that a weak/inexperienced player would go to a high speed table would be because they don't always pay attention to what they are clicking on in the lobby. I have seen this many times(not exactly with the turbo tables). When I was trying to finish some challenges for the FullTilt Academy, I was playing some Cap games and some Pot-Limit Hold'em games, and there would be people in there all the time that didn't realize why they couldn't go all-in or couldn't bet this or that amount, because they just clicked on whatever was open in the lobby and didn't pay attention to what the table actually was.