When is the rake insurmountable?

[johnnyhearts]

I'd like to know theory/ideas regarding at what point the rake becomes the only winner in a game regardless of disparity in playing strength of the players i.e.) There is a point at which Sklansky couldn't beat a game of chimps that have been trained to hold cards and put chips in randomly. What would that be? Let's take the more reasonable example of Sklansky playing $2-4 against the usual crew of loose neophytes (Let's put the rake at $3 + $1 for a jackpot promotion fund). I doubt he can beat it. Can he beat $3-6 being raked at the same amount? $4-8? At what % of rake can he make a big bet/hour?

Maybe this has been discussed before on here. Please direct me to the forum and thread please. Also, anybody that gets all mad about my saying, "Sklansky can't beat monkeys", just change the monkey part to "you and your buddies", thanks.