Well, dipping could be added as a potential threat to the hobby, depending on whether you feel it's legitimate. But... here's some more thoughts after enjoying a protein-rich burger... the coins that are given the highest grades, say MS66 and up, will tend to be (tho are not always) blast white. I have read that graders look at the luster. Well, mild dipping can help bring out that luster. I'm not an expert on dipping, so anyone can feel free to correct me. So we are creatures of conformity, even if we think we're not, and we will tend to follow the money. If a big chunk of that money goes to the blast white coins, it follows we will gravitate to that. I mean, very few people completely ignore values, I think - and this includes people who prefer natural toning over possibly artificially enhanced blast white coins. So saying blast white coins are not legitimately mint state attacks the TPGs, the wealthiest collectors, and a general grading consensus that has formed in the hobby. However, and I'll finish blabbering right now, all of this is subjective in the end. No side is objectively right, because it is ultimately about aesthetic preference.