the thing about doing the stickers, unless you can sell a lot of them, you are not going to be able make any decent money back on selling a few decal sheets if you do them properly (redo artwork, test for correct colours etc equals many hours of work). I own a signage shop, so I am luckier than most in that I can pretty much re-make any decals I need, and I've bought or downloaded many decal sheet scans. Even then for the limited number of decals I've made so far, I've spend a number of hours getting the artwork right and then testing colours etc, where as many repo sellers will just print off from what they've found on their home printer. But in saying that, digital wide format printers are getting better, with new machines having the ability to print and cut, print white and print metallic colours as well. So if you are after decals that you can't get, you still have an opportunity to get a set. But unless you can get buddy buddy with the shop owner and know how to re-do the artwork, you will pay a lot more than current ebay prices to have a few small sheets printed properly. So for the average collector, ebaying original decals will be the best option.
Given the copyright issues surrounding repo sellers, I have thought the next best option is for a database for people to submit cleaned up artwork too. As going to your local sign shop and asking for a printout of that, as its for personal use, would probably be within copyright limits.
