I don't know what Happy wrote but I agree with him
I need to go bed

Now I had the time to read MrSticky and Happy posts. 

It always baffle me when someone think that high definition automatically mean more cost than standard definition.

I mean what cost more: develop Pong for Atari 2600, PS1 or PS3 with their respective resolution ?

The game is so simple that probably only the low level language used to code Atari2600 games will prolong the development more than a couple of days for just one coder.

Disgaea 3 on the mighty PS3 surely cost a lot less than Super Mario Galaxy on Wii.

All depend on the scope of your project and to the fact that to leverage all the candies that console like PS3 or Xbox 360 can produce you need a lot of artist to do the assets.

But here is the point. Systems like PS3 and 360 were positionated on the market by their respective manufacturers like the definitive cinematic experience with the highest production values and a consistent part of those systems' purchasers like those aspects. Thus often productions for those systems try to excel at those aspects.

This doesn't mean that games like Katamari, Disgaea or Guitar Hero can't be on 360/PS3 but it is unlikely that they can shine throught other production that follow the philosophy of the system ( only a differentiation factor could help like in the case of Guitar Heroes and even in that case the Wii is a better platform because they share the same philosophy ).