Ok so better graphics take longer, but with motion capture that time is reduced, if you outsource it you pay once per title, if you purchase the kit to do it yourself, you pay once overall.
Some of the bigger production houses have their own in-house motion capture and everyone under that umbrella get to use it.
But do we NEED better looking textures? Or do we just want better looking games?
What if games are multi platform, PC, Wii, PS3, Xbox, does it cost more to upscale or downscale graphics? If consoles are the equivelent of mid range PC's, why does it cost more to create textures for them?
No because motion capture is purely for animation, which I already disregarded as independent of resolution. Plus, you can't plug mo-cap data straight into a game - it tends to be very messy and needs tweaking and tightening.
If you want better looking games, you need higher resolution textures. There is a direct proportional correlation. Imagine in your next Unreal Engine game with texture pop if the textures never actually ever popped in?
And as higher resolution HD becomes the norm, texture resolution needs to keep step, else there's no point. It would be like taking your old magnetic tape collection and just copying them to CD or MP3.
It doesn't cost more across platforms, but you would never upscale. They would be drawn at the biggest size and downscaled. Cross platforms costs are engine related, and the PS3 is more expensive in that regard because it is more complex and you can't easily adapt an engine from XBox or PC like you can there.