Because there is one person that is determined to win one of every title, regardless of cost, of both the golds and silvers.
And so far they have.
The other collectors that want to win one, any one, just keep pushing the bids higher and higher, but always lose.
About $23K spent so far, and there are still a few more titles to go for complete sets of both.
Round 2 should go for a lot less.