Keep in mind, a year ago the highest recorded price ever paid for a comic book was roughly $300,000. Now there are three "recorded" sales at over $1 million.
A year ago an Action 1 CGC 6.0 sold for $317,000 (current owner has turned down offers for much more than this) and a year ago Detective 27 CGC 4.0 could be purchased for probably $125,000-$150,000. Today an Action 1 CGC 3.0 could possibly sell for close to what the 6.0 sold for, and a VG Tec 27 could cost you upwards of $300k.
I'm not sure if its the media attention caused by the million dollar sales or what, but there are definitely some big buyers in the market right now for Action 1 & Tec 27 and for the moment supply appears to be having trouble keeping up with demand. (particularly for Action 1)
I sold an Action 1 CGC 2.5 (the infamous copy with the piece missing) for $45,000 a few years ago and can verify for a fact that the current owner turned down a $175,000 offer for it. (The offer came to me through heritage make an offer option since thats where I bought the book, and I relayed the offer to the new owner)
Where prices go from here, who knows. Unfortunately MOST of the recent action 1 / tec 27 sales have been private sales brokered by Metropolis, and there's no way to tell which of those sales are legitimate and which (if any) are simply market manipulation on Metro's part. But that aside, its not so much that the PLOD market has changed much in the past year, as much as it is that sales from 6-12 months ago for Action 1 / Tec 27 might as well be ancient history. This is just a guess on my part, but aside from maybe an Extensive 1.5 or something, I personally don't think you'll ever see a Detective 27 sell publicly for $50k again. (I bought the Tec 27 7.0 from Heritage and already have had multiple opportunities to sell at $70k+ but haven't done so because I don't think I'll be able to replace it at a similar price down the road.)
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