BANG OW,
Reasons for a 500 S&W:
1. You can spend a lot of money on new dies, bullets, and brass.
2. You can get frustrated at trying to get the perfect load for a caliber you are have no experience with.
3. You can scratch your head coming up with reasons that this caliber has something that no other caliber has, so that you can convince all of us to buy one.
4. (To paraphrase the Dodge Hemi ad) "Because its a 50."
mike
PS: OK, I read my post over and it's not real convincing, but it's the best I can do.