MVS carts serial numbers scratched off, why?

Why is it that you often see the serial number part of the cart's label scratched off? Does it have anything to do with owner registration / new owners trying to register and already owned and registered product?? Did SNK even offer registration?

ResOGlas:
Why is it that you often see the serial number part of the cart's label scratched off? Does it have anything to do with owner registration / new owners trying to register and already owned and registered product?? Did SNK even offer registration?

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This one has been covered before too, so if you want more analysis, just search.

From what I understand, re-selling of the MVS carts was either frowned upon or illegal (although I never heard of any arcade operator being prosecuted for it). The serial numbers could possibly allow SNK to discover who originally purchased the cart. So to prevent SNK from discovering who had re-sold their MVS carts, operators would scratch off the serial numbers before selling them.

Cool, thanks for the reply. I remember like 10 years ago when it was illegal to sell used games too.