400 for a board hashing 25GH? plus vat? I cannot take part then. around 1BTC i'd pay for 25GH board, but even that is steep, as it is readily available at that price (though at higher power consumption).
25GH/s? Where did you get this number from? AFAIK the "BitBurner Fury" boards are hashing at ~50GH/s.
Aha, stellar then.. but 2btc has to be max for 50gh. (inc vat)