Yes, from late 2019 through the first half 2020 the S9s were simply not profitable at even just a few cents per kWh, so miners were liquidating en masse and buying newer models. Example:
20,000 Used Antminer S9 13.5Th for sale in New York, USA
Price: $22 each
MOQ: 20,000 units
PSU: Included in price, the same brand/manufacturer as the miner
Of course, that was a MOQ of 20,000 units but on ebay, craigslist, telegram groups, and such there were many available at $50 and under in 2022 (down from around $200 in late-2019).
Yes, from late 2019 through the first half 2020 the S9s were simply not profitable at even just a few cents per kWh, so miners were liquidating en masse and buying newer models. Example:
https://mobile.twitter.com/offordscott/status/1270758788266680321
Of course, that was a MOQ of 20,000 units but on ebay, craigslist, telegram groups, and such there were many available at $50 and under in 2022 (down from around $200 in late-2019).
https://i.postimg.cc/W1ccDQvZ/Screenshot-at-2022-08-28-02-59-47.png
Source: https://data.hashrateindex.com/asic-index-data