Low price digital items are attractive to scammers because they can spend a very small amount of money to build up an account history. I won't pretend to know exactly what the purpose is.
When a person makes a new account, if the account behaves a certain way, or trips some sort of criteria, it can flag bots that will automatically delete the account.
It appears that you are selling digital images for 1 CAD. Odds are, the market for your product is people who want to build feedback, not people who want the image. The buyer no longer has buyer protection because they have been rmoved from eBay. So for all intents and purposes, the transaction is completed. Whether the buyer could execute a charge back down the line, I doubt it.
I would be a bit apprehensive to continue to sell them on an account that has any value to you. I don't know if they violate any eBay policy, but I would be a bit worried about the idea that your account could possibly be servicing multiple sketchy accounts that end up deleted.
