Should I buy a used game disk that has been polished?

I'm looking at a game I want to buy on eBay. The seller says that the "discs are scratch free due to our sophisticated polishing system". I thought I read somewhere that buying a polished disk is not a good idea. Does anyone know why that would be. I think I remember it said it leaves some kind of residue but don't know how this would effect game performance or anything else. Anyone know why polishing would be bad???
 
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