Squatters may purchase the RAM, but mostly they do not use it. Now, maybe 40GB is purchased, but less that 1GB is actually used. The BPs have no technical incentive whatsoever to upgrade. Also, as the

Incorrect. The BPs have no increased income from higher RAM prices. These fees go into a system account, and are held there ad infinitum to cover the costs when/if the user sells the RAM. No proceeds from