I plan on experiencing all side quests, and if there is any tangible buy/sell/trade aspect, I'll be all over it. I want to remain in the dark for most of this game so I can experience everything for the first time.
Already pre ordered 3 copies so far, that way I can keep the special edition on display, play the main game seperate from that, and then give away the other copy. I may be purchasing more copies in support for the company, because CD Projekt Red deserves it.