Rich
You couldn't be more right. They are going to mostly get wholesale prices from dealers who will re-consign the items to me or you, thus guaranteeing they get half or less of what they might have otherwise.
And of course, while the collectors do get many bargains, they also get over-graded and mis-described items that may well be poorly packed and have nosebleed shipping, which will cause a lot of headaches and cancel out many of the bargains.
All the more reason people who have collections should leave clear instructions on how their items should be liquidated should something happen to them. But few people do, because everyone wants to think they can live forever.
Bruce