The default buy-in for the site is about $10, which is perfectly reasonable for a game between friends. I've almost never played a game where the pot exceeded $100 (we had 6 people in a $20 buy in once, I think) and most of my friends have never played a game where having a $100 denomination would be any use at all.
This is something that most amateurs want, it's OK if pros don't want it.