I got into pc gaming later, so the first dlc I ever encountered were free map packs on Halo2. They were fun, added to the game, kept me playing longer and I appreciated bungie continuing to work at and improve the game even after release. I think the first paid DLC I ran across was in Dragon Age. I talked to some guy with a quest and it turned out you had to buy the DLC to continue. I didn't do it, it added nothing to the game didn't keep me playing any longer and garnered no appreciation in me for Bioware.
I don't feel that every ounce of effort put into a game is mine by right and hate the notion of day one or on disc DLC. I just have not ever bought any. I might be not the target market, but with me, you're far better off doing things that increase my loyalty to your company to ensure future game sales then you are trying to get a few more bucks right now with dlc.