Doing HD remake of PS2 titles is actually very little work and money, and therefore makes a lot more profit as a result. It would actually cost more to remake NEW and SNES title, and I could almost guarantee if you did that for the PS3/360, you'd never make enough to justify the effort since you have to basically start from scratch with those.

As for the topic, not sure how I missed it before, but the idea that FFXII getting an HD release would depend on how X and X-2 do bothers me a bit, if only because XII is a very different game.