Primarily because I've always wanted one and I expect the Bradys to get their way and put the .50 on the endangered species list. I've got my long range gun that is way more accurate than I am. The .50 is more for 1) fun and 2) make the Brady bunch cry at night. Stupid reasons to blow eight grand but hey, this is still America and I can spend it any way I want (provided I sell the car)Is this just for blasting, or are you actually trying to shoot ELR stuff?
The Barret would probably work for the former, but suck at the latter. Actually, if ELR stuff is your intended goal, you need to do a lot more research; that isn't something you just hop into.
Personally, I'd much rather have a Windrunner in 375/408, but I'm more interested in playing the ELR game.