Land is pretty much irellevent in the cost.

The Utah Data Center [0] is a 200 acre plot with 35 acres of buildings.

Even prime farmland values is arround $10k an acre, or $2m, but for other land you're talking $400k for that much land [1]

It uses 65MW. The solar panels alone to generate that cost $100 per kW in bulk, or $6.5m.

That's 570GWh a year.

Mount Signal 1 Solar plant, from over a decade ago, produces about that currently. Total cost $365m [2].

Then there's the lifetime? What do you do in 36 months time when you want to replace the hardware with the latest generation? In an earthbound one you turn off the rack, remove the old kit, put the new kit in. In space, it just burns up in the atmosphere.

[0] https://en.wikipedia.org/wiki/Utah_Data_Center

[1] https://www.land.com/property/201-acres-in-brown-county-nebr...

[2] https://en.wikipedia.org/wiki/Mount_Signal_Solar