Just wanted to point out that this isn't really true, or at the very least there are some large points to the contrary. Namely Dragon Age 1 and 2. Hell, Dragon Age 2 made the dlcs available before the game.
I didn't follow it too closely so I might have this bit confused, but I got the impression that the people who got Borderlands for the pc were awfully pissed about essentially having to pay for their bug fixes by getting the dlcs.
Considering how the notion of "release, then patch" has made game developers lazy and customers frustrated, I think its wise to be wary of any mention of a dlc.
This is not me agreeing with the OP by the way.