The average consumer isn't purchasing a lot of products with a lot of RAM every year.
Their 8GB of RAM phones will go up in price a little bit, but people aren't buying phones every year or even every other year.
So if the price of the 8GB of LPDDR went from $40 to $160 and it's all passed on to the consumer buying a new phone every 4 years, that's an extra $30/year in spending.
Most adults I know now use their phone for everything, so they're not buying new computers and laptops. They can wait 3 years for the market to settle before upgrading those, too.
Even I'm a heavy buyer of tech products and RAM, and I would bet you that my family's annual food bill fluctuates by more than what I've had to pay for RAM prices growing.