Yes I do
The flip side of that coin, is a bigger fanbase, meaning that the franchise makes more money, meaning a bigger budget for the next game in the series, thus a better game. Plus, not all ports are watered down from the original, most of the time the port looks better, and the second console gets a few extras that make up for having to wait longer for it to come to the system. Also, there is very little difference between the PS3 and 360 performance wise, whatever is done with sixaxis can be done with a slightly different control scheme, if the game doesn't fit on one disk, they can always use more (they did this with the original MGS, and I don't remember hearing people complain). I could see your argument more if we were talking about porting Wii games, since they are based around a controller that isn't available on the 360 or PS3
I can see where you are coming from but the argument is m00t. The odds of Final Fantasy XIII and Versus XIII being ported to the 360 are practically 0%.
I actually had a long argument on this that I ended up deleting because it's a pointless argument. 3rd party exclusivitity will always be there, as Microsoft and Capcom have done with Dead Rising, Lost Planet and Namco with Ace Combat 6 among many more 360 exclusives not coming to the PS3. That is a double edged sword.
As for the 360 fans tooting fanbase, get a clue. The 360 system has been out for over 2yrs and only has just over 10mil sales. That is not great hardware sales, not at all.