I've never minded paid DLC as long as the original product gives me good value. Mass Effect, for example, is a long, long game with a great story. It felt complete when done. And I actually enjoyed a little DLC to stretch out the experience after the fact.
Right now I'm closing in on the end of SM3DW and it's been worth every penny. I wouldn't mind if they released another world to explore, and I would pay for it. Unfortunately they said they wouldn't, so it's not coming. But I would like it.