The server goals are always met and I can see the Invade & Annex is $45 over its goal. No need for your restrictions.
'some who do donate are perhaps wondering why they bother, if they will again, when they continually witness the same players on the server enjoying all the same privileges without donating. '
You should donate out of the goodness of your heart my friend. Feel good knowing that without people like you, the server wouldn't exist. Think glass half full