Not true, 8x16GB costs as much as 1x256 on Amazon. The issue here is that Amazon is hilariously expensive in general. Hetzner will rent you a 256GB server for €460 per month. Or you can buy one from Dell for $5000. These are not high numbers, in 1990 you paid more than that for a "cheap" home computer. For the price of a floppy drive back then you can now get a 32GB server.