I hate to throw this out there, because its likely to cause a flame riot, however thats not a lot of our problems... I have PC, and XBox360, and I'm probably going to go get a PS3. PS3 is a better console, but they don't get the game contracts because Microsoft is the primary contractor for both PC's and Consoles, and as a consequence the 360 gets the majority of the good first releases.
Now before that post starts a fight about which console has better games, I love a lot of PS3 exclusive releases, but on average XBox360 games ratings score 1.1 points higher out of a scale of 10, and the 360 DEFINITELY has a larger library as well. Sure a lot of it gets ported over to the PS3 later, but this is a good marketing decision, and I for one would be extraordinarily disappointed with Bethesda if they folded to yet ANOTHER console and put more development time, and concern into meeting the needs of a larger population instead of just sticking to their guns and creating good content for a slightly smaller audience. Frankly, I'd be fine if they started only making content for PC, or only for Xbox. After all if they made ALL of their content exclusive, they'd have more time. money, and developers to work on creating more content, or just working on their next game in general.
On the same note just to disprove my bias, I personally wouldn't be mad at them if they made the switch to the PS3 and made it an exclusive release for the PS3 because they could make it a better game and release a lot more content on that system, and do it faster. If that was the case I would applaud their balls to worry more about the game quality then they worried about the gripes of people with their pet systems. Of course that's not going to happen anyways, so whatever.
Not going to bother responding to most of this, as it would only result in a flame battle. I'm afraid of fire.
I will say though that Bethesda games on PS3 have thus far ran worse than the same on 360...so I don't know why you think it would be better if made for PS3.
All that said, Exclusive DLC is pretty lame. It's just business, and most people who condemn it on Microsoft consoles would celebrate it on Sony consoles.
I'd prefer if we were to just do away with it altogether. I have a 360, so I got to enjoy it all...but it always kind of irked me that owners of a PS3 never got to enjoy the GTAIV expansions. That's not cool.