Hoarding anything in a marketplace at the expense of everyone else is a dick move. Obviously it's a more serious matter if it involves goods that people need to function in society, but still.
When a collector is stuck between not completing a set and paying an artificially highly inflated price, it's naturally a no-win situation. The worst experience of my (or likely any) '52 T build was, of course, Bartirome.
Some people actually celebrate it. This guy has been proud and very vocal about his attempt to "corner the market" (as he admits) on a '57 T mid-series card that he picked at random. And many of the responses he gets find it funny or praiseworthy. I hope those who do have to buy their own hoarded card sometime.
Anyway, he gave up on that hoard as it didn't work. And now there's this
https://www.ebay.com/itm/115372068351