I don't see a problem charging money for Pinnacle Station, but from what I read it's not even worth its price, it seems to be even less interesting than Operation Anchorage was to Fallout 3, they both even have similar game-play concepts. I won't buy it simply because I was sorely disappointed by Bring Down the Sky, and that one was free, if there's something that BioWare failed at, which is something they rarely do, was to bring quality extra content to Mass Effect, not to mention to fix bugs and change the inventory interface (which is a pure mess up, even on the 360 version), it took them a year for 1.02 and that's unacceptable when you look at the company name again, it's freakin' BioWare, but fortunately the game itself is good. They could have charged me money for two, three or more DLCs if they wanted, and I would have bought them if the general consensus would have been good about them, but as I mentioned even though BDtS was free it wasn't fun, and painfully short.
I hope they do a better DLC-related job for Mass Effect 2, if they do intend to make one or more for it.