It depends on your skill. If you're confident , you can play with 10-15 buy-ins and be a profitable player.
I disagree with this statement. There's something called risk of ruin. The problem with playing 10-15 buy-ins is that even though you may be a profitable player, poker is a game with very high variance. That means that it is incredibly probable that in the long term, you will go through substantial downswings, even if you are playing profitably. If you are at ~100 buy-ins, the risk that you will lose so much that you will be unable to continue playing is relatively low. However, if you are playing at a stake where you have ~10-15 buy-ins, you are almost guaranteed to get to 0 eventually.