BTC still at 40,000$ and etherium at 2400$ close to all time high but 2 GPUs I sold on ebay and craigslist are not selling anymore. Beacuse eth is abandoning POW? There are plenty other coins mined by GPU right?? Just wondering... 
afaik people money stuck on the bear market, they will save to buy some expected dip on the future and wont spare to build another rig.
So, supply increased will the demand decreased. If you want to make it sold faster, i think u need to lower the price before another seller start to do it first.