I was estimating to the very high side to make a point. One can easily get 10MW in the 500k-1M USD range, but I did see some very elaborate setups peaking out near $5M so went with that. Heck, I recently saw some on Alibaba for $100k, but I highly doubt Toshiba/WD would buy from there.
Lots of sites use them for backup power and simultaneously use them as regular power plants selling power back to the grid.