Just want to add, not only is it a ridiculous number because of sales, there’s also free games that wreck the numbers.
Glancing at my unplayed library, sure there’s a bunch of leftovers from Humble Bundles I got ages ago for what amounted to a fraction of retail, but there’s also things like BioShock 1&2 Remastered - games that were given out FOR FREE to owners of the original. I’ve PLAYED the originals, but I assume the powers that be would tell you I have $60 worth of unplayed games sitting there since I haven’t opened the remasters.
For the ADHD crowd this is often literally how it works.
No stimulants? My restless leg will shake this whole building down. With stimulants? I can sit there at my desk, happy as a clam.