Okay, I thought of an alternative.

When looking at crafted gear in the market you will see the signatures. Selecting a signed item will give you this in the purchase prompt under the item name and price:

This item has been signed by
First Last
[ ] Remove signature
(Accept) (Return)
If people opt to remove the signature the tax on the seller will be reduced by an additional one percent as compensation. No bonus nor penalty will be incurred on the buyer. It's win-win, or at least somewhat close.

I still prefer names being irremovable.