Since this is a cosmetic issue and somewhat subjective I think it would be more cost effective for CGC to handle it on a case by case basis and work to satisfy each customer, than it would be to put out a single solution for everyone (even those who don't notice a problem) that still won't satisfy everyone.
I think there will always be variations in production that could effect resale value, depending on how anal the buyer is. The variance in the graining on playfields from many of the manufacturers (not sure about MMr) is a good example. Sometimes the clear looks smooth as glass and sometimes it looks rippled.
Not being able to see exactly what you're getting is one of the major drawbacks to buying NIB.