You still didn't got it

if an exchange sets it higher than market is, then almost no one is buying; if they set their btc lower, then a lot of people will buy it to sell on price

there's currently millions of bots working on these to farm money of the ppl doing it, and exchanges systems are also doing it to ppl that sell lower than market order

if isnt there a lot of people buying on 100k then it will not reach it