While I think the min donation is a bit silly, I can kinda see why they have it. After all when you donate you are protected currently from being booted (the Enthusiastic Heart thing). I would suggest making it free to donate any amount, then leave the protection amount as 1%. To further help newbies, allow the protection amount to cumulate over 1 week then reset. If they make 1% over the course of a week they get the boot protection.