UPDATE
1. We need to purchase more powerful servers, so enabling 0.5% fee for a week or so
It's not fees that drive people away from your pool. Look at other pools, nearly everyone there has a fee, 0.5-2% is pretty standard.
If you put similar fees and arrange better stability and better service and better features, you'll catch them up.
Agree, but now it's kinda late to do it better as many people have zergpool in the blacklist. So many complains and no reply from admin, he only post things when he wants.