Um in the UK Wii games are the same price as 360 games. With PS3 games usually £5 - £10 more expensive.
Yes even Wii mini game games are released either £34.99 or £39.99. Same as 360 releases.
What did you expect? Kinect games are valued depending on user. What seems like rubbish to you isnt rubbish to the casuals.
I bet the casuals laugh at people paying £39.99 for Halo Reach. They probably think what a waste.