Hi @genx-collects, sorry you find yourself in this situation.
On eBay, as discussed, there is a requirement for tracking to protect seller interests from Item Not Received claims. If you cannot afford tracking for delivery confirmation services because your profit margins are too small, then something has to change.
That might mean determining how to sell at improved margins, by bundling, increasing prices, whatever works. Or by selling differently, such as by introducing a product that gives you the ability to adequately compete on eBay. It’s clear the current cards aren’t doing this. You might check out some other popular selling categories/items on eBay at WatchCount.com for ideas.
Honestly, i have never had a buyer attempt to defraud me in the nearly 2 decades i’ve been selling here (this is a posting ID). But all my packages have tracking. So i can give buyers the benefit of the doubt when they report an issue. As a result, I do find it hard to believe that all your buyers are scammers if they reported non-receipt of their cards. There is no way to know for certain without delivery confirmation.
First thing i’d do is send myself a dummy order exactly like a regular sale to see if there's some other reason for a rash of INRs. Bad envelopes? Damage? Sub-par service by the carrier? Or whatever phenomena there could be in way of explanation. I would definitely do some investigation. But still, on this platform, as i said, sellers need tracking to best protect their interests.
By the way, receiving advice that is hard to hear may be misconstrued by the recipient as an attack, but I read the whole thread, and the only thing i noted were your some of your less-than-cordial answers to tough (but accurate) criticisms. Constructive criticism isn’t necessarily an attack. It is usually an opportunity to evolve, and thus, it is important to learn to accept with good grace.
Best of luck to you whatever you decide.
