I've sold perhaps 65% of my collection over the last 18 months, of course if I'd waited to let it all go in the last 4 weeks I'd probably have doubled what I made.
Kept my absolute best stuff and will never sell it. Wife/kids will get it as part of the Estate I leave and do much better selling it then because it will be far better tax treated.
I decided that I'd managed to buy what I have with money that could have been used on other things that simply disappeared as a consumable, and instead will have residual and hopefully far better value. And having largely finished collecting I now see it as outside our needed per diem.
It's the apple stock I was never smart enough to buy, earned through spending hundreds of thousands of hours learning everything I could about players and their cards and perusing millions of pages of on-line auctions.
I've earned them all, I love them all, and someone else can let them re-appear to the public market once they are no longer under my protection.