I've been playing bass for over 20 years and I can't understand why anyone would need such a wide array of choices either.
Electric guitarists seem to stick with three or four different sounds that have been popular since the '50s and '60s, and they're right up front of the mix where people can actually hear what their instrument sounds like. Bass players are going to be mostly making a low humming noise behind that - why do they need so much variety?
Guitarists mainly stick with the classic instruments, yes, but rarely do they play them without going through numerous effects boxes. Both guitar players in my band have pedal boards, the lead guitar player has probably invested about $3K on his board. So, yes, they play the classic guitars but people don't really know what they sound like in a "clean" setting.