Finish checking to me, means micro cracks that you see in real old guitars with a gloss finish. If it was a 1950's Les Paul or Strat, there may be some value added. Matter of taste I guess. I have a 1965 Hagstrom 12 string that has a lot of checking, and nobody wants to buy it. For a 6 year old satin finish, checking would be strange, and would make me wonder if it was stored in an adverse environment, like an attic in Arizona. My vote would be reduced value. Just my $0.02

Joe