Agreed, but there's a difference between a "dirty" box (excessive wear, punctures/holes, pancaked) and a less than perfect one.
I have five THs NIB--I don't usually discuss #s of sets because A ) Someone will always talk about how many more he/she has and B ) I'm not the guy who talks about how many more I have. Ego should have no place in investing, IMHO, but that's a topic for another thread.
I'm happy to have landed those THs as I came in late (started investing in September, 2014) and just happened to take Mr. Mack's advice. A few have some minor box dents and creases, but do I care? Heck no. Are the boxes "damaged"? Not really--it's several pounds of bagged plastic bits sliding around in a cardboard box; hard not to have a few minor creases. I'll fully disclose box condition with several pictures when I sell. The one TH, my sixth, that Walmart sent with a sticker on the side and the flaps popped open? That's the one I built for me because I could give two s**ts about box condition.
"Mint" means less in LEGO than it does in other collectibles. "NIB" or "factory sealed" means more to me--personally. I think "MISB" is a brass ring you can chase and chase, but someone picky enough will find a reason to nitpick the tiny scratch or rounded corner. I will never use the word "mint" to describe any LEGO box when selling, no matter how pristine. It's just not as useful as "new in box" and sets a seller up for all kinds of OCD buyer trouble down the road.
This is just how I do business. YMMV--and your opinion.