Its very hit and miss and because sometimes it can take years for milk spots to appear, it best to store them for long term hidden away in the dark with no air flow. As for the resell, i have seen milky coins sell on eBay for the regular price's on good days. I have no idea why the mints are not doing something to cease this from happening. Surely it would be a simple re-rinse and move on. Its maybe not as easy as that but why is it not?
No problems, only 3 questions buddy. Thank you for reading and commenting on my post.