No support, if I imagine something the way I want it to be and it doesn't come out the way I thought it would be, then I shouldn't have to pay. However, an alternative for graphic sellers is to either:
A) Force a payment for their services, not their work (up to the graphic creator)
or
B) If a (buyer) person doesn't like the work created, they should be required to pay a specific fee that is arranged with both the buyer & seller beforehand. Failure to pay would be scamming.
Of course, me asking for a blue sig with a specific style is not created and instead a green sig with absolute paint garbage is created, then I shouldn't have to pay.
Again, I'm not saying my rules should be made official, but maybe an idea for gfx artists to use as part of their ToS or whatever.