I started my Poker career in $50NL and in one wonderful week turned $50 into $1000.

So the answer to your question is - there are still enough donkeys at that level (the only difference was that I was a lucky one) to make money from.

On a more serious note, at that level I didn't go to many showdowns. Heavy pre-flop, heavy post-flop betting and that usually weeds out the ones with drawing hands.