Prelude:
Fame at this point is almost useless. You can create a guild, which only a few do, or you can feed your pet. Feeding your pet is great, but when you have thousands of fame you can’t use on your pet because you don’t have high feed power items, it becomes frustrating.
What I suggest:
Players should be able to purchase character slots, vault slots, name changes, and dyes with fame.
Simply put all the things that don’t give you an edge over another player or affect the economy of the game.
If desperate enough a person could make a whole battalion of mules, which is inconvenient for both parties.
The fame you need to pay wont be cheap, I’m thinking towards the line of 5 - 10 times that of gold, but of course DECA can choose their own pricing.
Other Notes:
If you are worried about DECA losing money, you need to think that this change will most likely bring old and new players into the game and they may spend money on keys or items. As well, there will still be the people who use gold to buy pets, vault slots, and character slots for sake of convenience.