I just counted 14 different capos on my music stand, and I have others. Mostly Shubbs and Keysers, some cut up for Em, drop D, double drop D, A/dadgad, Asus2, inside 2 strings (whatever that chord is I always forget), G9, A6...Most of these will fit most of my guitars but my 12 string requires some of its own. I also keep a supply of air hose around for additional string cams to experiment with new partial tunings. Many of these capos in combination will yeild other cool voicings like E, Am, various 5 chords and so on. I also have some capos for use with actual DADGAD and open G tunings.
The reasons I use capos are to accommodate someone's or my voice, use open strings and drones, get voicings I couldn't otherwise physically reach, supply timbres different than other players I may be playing with, allow me to have a free hand for percussion purposes, imitate other stringed instruments like the mandolin family, actually raise my action slightly for slide (those ones are made of Corian or brass), and to transpose to guitar friendly fingerings, etc...
The ones I use the most are the drop D because I like key of D type fingerings but with the low E root note, and the A/dadgad because I can get great drones with it either way.
God help me if I ever get a 7 string guitar, I'll need a bank loan just to get more capos.
I've never subscribed to the idea that a capo is a crutch of some sort, any more than windshield wipers or headlights are to a car. Capos simply allow you to do more with your guitar.