All depends. If its good, large dlc, like Shivering Isles for Oblivion, then sure, go ahead. But day one dlc is irredeemably bad, and hour-long dlc is also terrible.
I have nothing against weapon pack dlc, as I simply don't buy it. Same with cosmetic dlc. If the absence of the dlc won't significantly effect my game, then I reckon they can do whatever they want. Also, I hate dlc that you have to be online to play. I don't have a very stable connection, so having to try three times before I can play my Fallout 3 dlc is just irritating.
Dungeons of Dredmor had good DLC. Everything is cheap to begin with, but the first dlc you paid for - it added 50% more to the game. The second dlc did not, but it was free. The third dlc added whole new dimensions, and was also cheap. Significant expansions were paid for: lesser one s were not.
But hey, pirates don't want to pay for anything anyway, so thinking the greedy buggers will pay for a game with free dlc is nothing less than naive. Didn't The Witcher 2 get pirated way more than it was purchased? So yeah, it was a nice theory.
EDIT: Yeah, it was pirated around/over 4.5 million times, according to the escapist.