Wii may be succeeding in console sales but i doubt their games are selling well, the Wii is by far the easiest console to mod all you need is some programs and a USB and there are even tutorials on youtube..
Example: http://www.youtube.com/watch?v=0Jv7TrYpqkg There are countless videos!
However to do the PS3 Or XBox 360 there is a lot more effort required and if you do either of those you lose all of your online privledges in a matter of days (Microsoft scans your xbox not sure about sony though)