If you buy a 100 heroic character through the DB store, can I trade it to another account or is it just for the account it bought on?
That's basically what SWTOR did - just about everything on their marketplace is sellable, so people buy stuff on the market - usually the flavors of the month that went on sale this rotation - and sell them on the Auction House.
I mean your paying good $$$ for them why not make them tradable. Its almost like they dont wanna make $$$ on the marketplace.
If you want to trade it to your friend family, log in your family account, put in your CC.. buy them a heroic, remove your CC.. log out.