I think there should be a leaderboard for each server for which players have donated most balloons, with maybe a seperate prize for the top 3. Its all good and well offering for a server as a whole but there will be very big differences from certain players and I do not think its fair that players will get rewards for other players doing all the hard work.
People like leaderboards also if I knew I could see all on my server who were donating it would make me try that bit harder to beat them. At the moment it is just blind donating
And let the criticism begin...