though this was not originally my idea, this was an explanation of how they do it in SeireiteiRO, a bleach themed ragnarok server. I just wanted to share new ideas in donation rewards. I myself can rarely donate for servers as I have no paypal account and what not. And i find it difficult to play DK servers without coins, so I'm hoping for a really good server that offers the coins for dil instead of $$ from donation rewards
This donation reward system really works great in SeireiteiRO, they run the server with non-donators in mind.
As for the implementation in DK servers, the voucher idea sounds good, make the voucher tradeable, lets say the 3 lowest vouchers. Turn 2 of the rarely used maps in DK pservers into one of the Voucher maps where the vouchers will be dropped.
The mobs in the easiest voucher map would have moderate hp,attack, etc, enough to be killed by early players. The mobs would be abundant with constant spawn times
The second voucher map would have a stronger mobs, enough to make parties a slight necessity for easier farming, but still solo-able. Moderate number of mobs with constant spawn time of 5 minutes per mob, or depending on how many mobs would be implemented
and last but not the least, the third voucher would be a donation reward, which can in turn be traded for high end items. Lets say, change the items in the exchange centers (for crepso and 90 dp in real server) into custom items but non too over powered.
This was just a quick thought, I thought of it as I was writing my reply lol.