Only one VERY IMPORTANT thing: you have to declare the applied fees.
It's not important how much your pool is performing good, if you guarantee good payouts people will continue mining even @ 5% fees, but you have to tell us how much we're paying for the service.
That is true, you must tell us. You can't just say that on the worst days you take as little as 1%, that could still mean in the best days you take 50% lol.