Moving Up In Stakes

[The Lipo Fund]

I know most people suggest having 100 buyins for SNG play due to the variance involved. But at the lower stakes, people seem bad enough that even with small leaks in my own game it is +EV to play higher stakes than my bankroll can allow. Based on your experience would you say that the $15 sngs can be beat on a bankroll of 30 buyins? 40 buyins? For a regular at those limits what is your biggest downswing buyin wise?

I was a regular in the $3 sngs for awhile and found the rake and 10 people to lower my ROI. I have moved up to $6s with great success over 300+ games. I am thinking about moving up to the 15s by the end of the year and don't want to have a high risk of ruin.