I'll cut to the chase - Because you're crazy :-)

You want to, whatever. I'm not nearly as eloquent in my writing as some who have addressed this rather central question and I wanted to pass on some pointers to get some thoughts going.

Definitely something to think about before you jump in (and during and after)...

Gerd Mueller has some good commentary and logical thought at:

http://www.yago-project.com/content/view/72/66/lang,en/

Frank Hagan has a more seriously toned, but very thought provoking article at:

http://users2.ev1.net/~fshagan/question.htm