Used Vinyl Record Sellers Over-Grading Records

[Diskos]

I'm quite new into vinyl, but already have a couple of experiences with overgraded vinyls. It's quite discouraging since not even good seller ratings are a guarantee anymore. I've had some Gemm sellers with 100% grading accuracy and half of the LPs were clearly overgraded. I don't have much experience with trading vinyls, but the grading system is still fresh in mind, because I've gone through it thoroughly (Goldmine). Well, sometimes a sellers is doing his own thing with grading systems, but many vinyls are overgraded one way or the other. Many sellers have tens of thousands of vinyls and therefore it's difficult to imagine how the seller would have time to assess the quality of each vinyl and its cover. Sometimes, covers aren't graded for some reason. Foxing (small brown mildew stains) is a widespread problem but often ignored.
I don't quite know how to handle this, I have to ask for at least a partial refund with easily 1 of 4 sellers, which is always bothersome. I think one problem of seller rating systems is that they may be ingeniously designed but lack enough critical users who leave well-founded (and thereby laborious) feedback. Nobody is perfect, so the countless 100% ratings are a sign of insufficient scrutiny.

P.S. Did some admin edit the thread title?

[Cory Ander]

the only solution I can think of for that problem is to have a written "money refunded if not satisfied" agreement. The risk involved in internet transactions is why I don't buy vinyl albums from websites.