Your envelope is more inflated than bitcoin itself. I am a miner, and i was a miner back in 2011. One of my rigs right now uses 923W with 6 high end graphics cards. That rig costs me ~$3/day * 365 = $1095.

Do you really think you can hide the amount of heat from anyone - my rigs are basically a furnace - and in 2011, I think I could probably melt steel =P The guy may have had a few cards in there, but $20k is absurd.