[LearnedfromTV]

Playing at a level that makes your net worth at least 100 buyins is smart for anyone with real expenses (that is, anyone out of college). It's also reasonable for someone with few expenses but a normal risk tolerance. Putting your entire net worth into a 30 buyin bankroll is extremely risky relative to the way the average financially intelligent person allocates wealth. This doesn't make it wrong, just like investing in lots of volatile stocks isn't necessarily wrong.

Holding 100 buyins in a poker account, or a box at the Bellagio, or anywhere else where it doesn't earn interest, is dumb, with the possible exception of leaving money in a poker site that may be hard to deposit to, especially if you expect to move up soon. Calling 100 buyins your "poker bankroll" as though you should ever go through 100 buyins without moving down multiple times is dumb.