It's all about price.. BTC Miners are losing money until btc's price up to 10k$...
I'm a gpu miner of Minexcoin and difficulty increased by 10 times last 30 days. Still it's better than ethereum mining.
Anyway, this job is still profitable but it wants labor and time and the profit is not enough for my labor. So I'm thinking about selling my cards...
I guess that now large number of people are looking for alternatives for mining. So I doesn't surprise me to hear that difficulty for Minexcoin increased 10 times. Many consider bailing out like you do, and I guess that is reasonable. If profit doesn't cover basic thing, its not worth doing it. So I guess that because of this things people are selling their equipment for such low prices that OP have seen.
With everything that is going on and things that are comming, we will see even more of things like this.