Donator's had a shop in the old server, and I thought it did ruin the economy.
I vote no as well. The cape could be something you could donate for, but honestly donators are fine as is.
The donator area in the old server had a shop for capes, bunny ears, and scythes as I remember. Bunny Ears and Scythes sold in the donator area for 100k, but people sold them for high prices and it was a very odd economy..