It wasn't a big operation, the mushrooms were the first product on the site and that's exactly why he was growing them in the first place.

Go read the journal, it's interesting. It's also interesting to compare the early verbose, idealistic diary of 2011 against his later notes on running the site in 2013, the latter of which (if genuine) are quite chilling. Routine stuff about DDoS attacks and PHP upgrades and whatnot is punctuated with statements like "arranged hit with angels" as though arranging a murder was just another entry on the day's to-do list.