I thought I had a good chance of picking up this set under $5k. Remember that this is a mostly raw set from an auction house run by an oldtime dealer which usually overgrades a touch.
I will say the this set is getting more and more popular. Just a few years ago, the PSA 7 commons would sell for under $50, but now they often go for over $100.
I guess it helps that some of the key cards are graded 8 and 7.5, but they are SGC. Personally, I still like SGC, but many people will want to get the cards switched into PSA holders.
For $13000+, I would expect the set to be graded already! I have had cards from this set returned by PSA due to trimming and coloring, so it's easy to get ripped off on raw singles.
When I see the prices the auction houses get, I wonder if the bidders ever look on eBay, or if price simply isn't a consideration for them?
Personally, I think this price is much too high for this set in ungraded condition, but as long as someone is bidding, it must seem fair to them.