Curious? Here's a look at select auction results. Knowing me, I won't keep this up, but hey, not like I have much else to do right now. Except work. And parent.
I no longer use GPA, so my comparison for FMV is from GoCollect. Generally, I selected books that were likely to land over $1,000, were exceptional copies, or which trade frequently. If someone wants to add GPA data, DM me. I'd be curious to see that column added. For the Gold lots in ComicLink, GoCo won't have much information, but I may record the hammers anyhow.
Anyhow: the data.
UPDATE (04 Apr 2020):
I doubt that I will capture any more data from the current ComicLink auction. Here are captured results through last night. The remaining night of comics lots includes "assorted." There are always some keys and such there, usually lower grade copies of ones offered on the preceding days, but it's mostly less desirable stuff.
Here are some observations and thoughts after watching this.
This is obviously a very limited dataset. It's not the complete auction. It's only one auction. It's an auction during a period of high economic uncertainty. And the data I captured was loosely defined.
I looked for frequently traded books, only blue label books, high dollar books, and books generally accepted as keys or having some other collector significance.
Since I was using GoCollect for a FMV comparison, I did not capture results from the Golden Age nights since GoCo seldom has a FMV determination for these comics.
I watched most of these results live, and the folks who complain about sniping on CLink have reason to complain. Almost all of them had bids in the closing seconds.
For high quantity books (think a book where you'll see a 9.8, 9.6, 9.4, and possibly additional lower grade copies for sale), the bargains were often on the 9.4. I am defining bargain here as the copy that was percentage-wise the most below GoCollect's FMV.
The average % change was about -12%. That number was very consistent throughout. Only last night did it actually drop under 12%, to 11.88%. Prices seemed obviously depressed but not bottomed out.
Of the 331 lots, 61 hammered at or above FMV.