Honestly my opinion is if they want a true gold sink, do like that, do top 10 donators get a special item. then give a chance at winning something else for everyone else if they donate so much. But make it a high ammount.
I wish the kickstarts were better gold sinks honestly, I remember a few of them that the top 10 donators got a rare item(a cruz halo, only 10 of each on all of gaia)
That got people to donate tons and tons to try to get one of the halos.
Then they use to do you donate like 100b and you have a chance to win an item like a cv box or something.
Most of the gold sinks lately there hasnt been much reason to donate over like 7.5b since you dont get anything for donating more.