About $10 per seems to be the average rate that people are willing to pay for a single custom patch(preparation included). However, almost every seller ends up with incremental volume discounts due to the easy repeatability of cnc lasers. So approximately $11 each (before design fees) for a volume run is definitely on the steeper side of things.
There has been a large discussion in the glowforge community about pricing and being undersold by larger providers on Etsy, Ebay, and such. If the product you are selling is not - in itself- markedly unique, you have to make a choice. Do you want to hopefully sell a lot, and make a little profit on each? Or probably not sell many, but be better compensated for the time you do spend in production. Unfortunately, most of that decision has to be personal because it depends on how much your time is worth to you, more than anything else.
If you want to stick with your proposed pricing scheme, I would suggest trying to find ways to make yourself stand out as a more premium option for those who are willing to pay more. ( cruelty free leather, free design help, etc) Best of luck with your sales!