I found this odd. My goal is to scan as many cards to the Herschel Walker page as I can. I check the entire gallery listing fairly often, as new spaces for cards are added from time to time. On the 1990 section, there were two new blank spaces for #105 Blank Front in both Disclaimer Back and No Disclaimer Back. These spaces were never there for years, at least as far as the blank fronts. I saw one for sale and bought it, then scanned it to the page.
A couple days ago, I went on and the card I scanned was removed, as well as the other blank front space. I did a forum search and found that these were discussed in 2016, and that they were printer errors, and the database did not find them acceptable. That's fine, but I don't know why the space was never there, even way after it was found that they weren't acceptable, then suddenly it was there.. No big deal having the error card, as a single player collector, but I guess it was a waste of a scan.
There's no intrinsic value in cardboard, but there's a lot of value in doing something you enjoy!