Because it is a baritone dum dum so you can play all your favorite slipknot songs I guess but think how cool it would be if you have six guitars all in different tunings.
k thanks dude. i don't really know much about baritones, as you can tell.... but slipknot plays in drop b and drop a and they drop all the strings. and yea that'd be awesome have guitars in all different tunings. that's actually what i do with the 2 i have now. ones in drop c and the other's in standard