I don't know, I am a picky coffee drinker, but I would think the pros that I buy from can do a significantly better job at roasting than I can in my stove. Money spent on that premium is of no concern to me.
It looks like just finish cracking, could be the top coat, or the dried wax polish. Other than putting some Lexol on it I'd live with it. If you use renomat to remove it you're likely going to ruin the museum finish on it as well.