At least company scrip was used to buy food/normal goods, albeit at a large markup. "Blizzard bucks" sound completely useless unless you're really into games
Basically, say Blizzard compensates you $20k in Blizzard bucks, and you auction off $20k worth of items at a reduced rate, you end up taking $20k * discount rate from Blizzard’s revenue, roughly speaking.
You cannot do that, ToS forbids that, and if you were caught i expect that consequences would be harsher than just a ban.