They just try to make price go down so they can buy at lower price.
go ahead be my guest to buy, bitcoin is breaking into $4xx soon,
why don't you buy "cheaper coins" now? because they are going to be much more cheaper

So you want to buy them cheaper because you know we will see ATH next year.
there is no "cheap coins" if bitcoin keep dropping down everyday
The term "cheap" should be compare to production cost.
The production cost for an average miner is higher than 600 per coin, and slightly lower for the ASIC manufacture.
Unless bitcoin go away, the coin price has to go up at least above the production cost.
the production cost doesn't decide bitcoin's price, supply and demand back up it's price
so if less buyer than seller, bitcoin drops lower than the production cost until miners decide to cut loose and stop mining (the end)