The guys that love them love them.

whether or not you use it (or any choice of equipment) does not make you taller, or smarter, or prettier or intellectually superior. We all worked before our present setups came and and will work into the next generation of equipment.
They don't transform you into a better musician, a lame act is still the same just louder and with better coverage.
For Me:
The Bose has replaced 2 15" and horn cabinets, two poles, sub woofer (sometimes 2). Power amps, cables, equalizers, crossovers, & monitors.
For private parties, & smaller venues, sometimes space is at a premium and with the Bose I can set up in 1/3 the space without compromising on a smaller system.

I really don't understand the passion from those that don't own them and want everyone else to buy their brand.
I want all my competitors to buy 100 dollar speakers from radio shack.