Read the listing, it's a set of sheds, not an irreplaceable buck of a lifetime.
People collect these bucks just like other people collect cars, guns, coins, and other valuable items and when the time, or the money is right they sell out and get something better for a better price.
On the other hand, the buyer is normally an antler nut that either likes the set of antlers a bunch so he or she buys them with their stash of cash, or... the buyer is purchasing for a collector like a few of our nation's largest sporting goods retailers. These purchases are for exhibits or displays and will result in a nice tax deduction at years end.
This buck will probably end up in a public place where we can enjoy it instead of on the living room wall.