I recently looked up 2x48GB RAM kits and they are around 300€ and more for the overclockable ones. That is 3€ per GB and this is in the more expensive segment in the market since anyone who isn't overclocking their RAM is fine using four slots.
The end of that chart is in 2020 and in the interim the DRAM makers have been thumped for price fixing again, causing a non-trivial short-term reduction in price. But if this is the "real" price then it has declined from ~$10/GB in 2012 to, let's say, $1/GB now, a factor of 10 in twelve years. By way of comparison, between 1995 and 2005 (ten years, not twelve) it fell by a factor of something like 700.
You can say the free lunch is still there, but it's gone from a buffet to a stick of celery.
