I actually agree with you. I am playing $100NL with 60 buyins, and I'm not playing anything at $200NL until I have 40 buyins minimum. I'm probably too conservative, but I really think that being safe about it is a good idea, especially if you can't afford to reload if you go broke.

If you start to run bad and you don't mind moving down in stakes, though, you don't have to have as many buyins.