The biggest factor is the the small number of official carts they are releasing. They are rare the day they come out. It's like baseball cards. They started overprinting them 20 or so years ago and they became worthless. You can't sell most of them from the past 20 years for the cost of shipping them. They finally fixed the situation recently and now I think it's only 1 company producing them and they watch for over-production. They have certain ones where only 1 card of its type ever gets made and they go for thousands on eBay. If they printed 100,000 of them then it wouldn't be worth 5 cents. Also, you can't always just burn roms into old carts and print new labels, at least not MVS, I've never opened up an AES but they are probably similar. There are tiny jumpers that you have to know the right settings for and different card layouts and sometimes to protect bootlegs the bootleggers put some roms on flash chips which way fewer people can read. Probably a good chunk of the boot MVS games in unofficial builds are not correct full dumps.
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