Because supply and demand curves aren't smooth - Increasing production scales linearly up to a point, and then you need to build a new factory. Samsung is pumping out all the SSDs it can produce. It is probably also building new factories, but the capital investment and lead-time on that are significant, and until those factories come online, they're simply sunk cost.

Customer demand is not smooth. I will buy precisely 0 SSDs at prices > $125 per 1T drive, and I will suddenly buy 4 as soon as the price drops below there. There are thousands to millions of other customers will scattered plot points around that area, but while you can draw a smoothed graph over them and be reasonably correct, they do not actually represent a mathematical law.

Further - Information is imperfect and markets, for all their elasticity, are only trending towards efficiency.

This all assumes you're arguing in good faith. This in itself is an unreasonable assumption - Your last, mocking line seems to belie it. As does this line.