no need to lower the price if people are buying it anyway

they would be stupid or something
and worth to mention is there is only 15 days warranty from shipping out on batch7 s5.. so thats probably like week warranty when u get miners

So true

which leads us to the conclusion that buyers would be so so stupid

basic economics of supply and demand. If you want to buy a miner, your options are currently quite limited.
It will not last long, though, if prices will go on the upswing.
NOT working (for parts or repair) SP20 has a $406.01 bid right now on ebay with 4 days to go.
I know . And you are right of course. But my life does not depend on it. It is not a life saver medicine. Same applies for sall called "demand". But if demand squeezes bitmain to sale so hard he would not mind to make good money again