[Blacklite]

1: There aren't really any rules on donations, you can charge people as much as you want and choose to give them lots or no benefits. You can use the donation money for whatever you like (as some people have shown), your donation systems are not in SA:MP's control in any way.

2: There is nothing stopping you running an MTA server as well as a SA:MP server. Just don't come here asking for help with MTA servers

Refer to Infinity's post for the rules for running a public SA:MP server.