UFC 2009 Undisputed: Why not more downloadable fighters?

For any of you who play and love UFC Undisputed on the X- Box 360 I have a simple question. Why is Zuffa and THQ not flooding the market with down-loadable characters? They should be selling classic fighters like Shamrock, Royce Gracie, etc. for Microsoft points. What UFC fan wouldn't love to add some classic fighters to their roosters as well as some new up and comers who did not make the game but are now making waves. I don't understand how difficult it would be to add down-loadable TUF winners and others. It would make a great game that much better.

While we are on the topic of UFC Undisputed, there are already training sessions in the ring. Since Zuffa owns Pride why not have a Pride mode when you could stage a classic Pride fight in the white Pride ring? They have to add this to the next version of the game. IT doesn't make sense not to include it.