The situation that spurned the debate is as follows:
Pretend you're surfing around etsy looking for something unusual that popped into your head, say, a dress for your toddler that has blue and purple bunnies stacked on top in a column up the side because she just loves blue and purple and bunnies.
You don't find it, but you find a seller who makes similar items, and ask her if she does custom work. She does! She makes your dress, you buy it, yay.
Two weeks later you're browsing around and see the EXACT same design she custom made for you, and it's in her shop for sale.
How do you feel? Does she have a right to sell things she can make, or would you consider the bunny idea *your design*, and expect it to remain one-of-a-kind?
sellers who resell your custom order...
what if you'd paid her a higher price for the custom item, but now the item's listed at the same price as all her other stuff?