The Zoo takes 1% maintenance fee every 2 days. It takes 11 Million points to maintain the top tier, 11, which is the Silver Steed. At tier 11 we lose 100,000 points for maintenance ever 48 hours. I also try to donate 10,000 points every 2 days while working my tamer, any more than that will drive you nuts. So basically we just need everyone to donate a little daily or every other day to maintain the zoo. Two or three of us just can't keep up, but if 20 players were to pitch in it would actually be easy...