Honestly, I would never trust a pool which advertises to use a fee of 0% ALWAYS. I'm running a decent pool myself, dedicated hosting, which costs me quite a few euro's every month. The fee is what is helping me in getting the hosting paid every month... and to be honest, I nearly break even some months, which makes this more like a hobby project I spent my own hard earned cash on.
Don't be silly. Many pools make their fees 0%, and survive on donations alone. In its prime, my Tagmining.com pool was easily handling 400-600MH on big swings, and was the number one pool in the world for TAG. That pool resides on a $20/month VPS. It is 100% possible to fund that with donations alone.
Don't judge on stats... judge on the actions of the pool op.
-Fuse