Like you, I went to music school where I earned B.Mus. and M.Mus. degrees from Manhattan School of Music in Composition. I minored in Conducting, Piano and Trumpet. The sheepskins are probably two of the most classic "underwater basket-weaving" degrees in terms of employment. (Ironically, I've done pretty okay!)
Because of my years of music production work, I have a ridiculous collection of electronic musical instruments. At the peak of my craziness, I had three separate small studio set-ups. I've accumulated 14 keyboards including a Baldwin upright, 1974 Fender Rhodes, 1975 Wurlitzer Electronic Piano, Hammond B-3, MicroMoog, Korg PolySix (with MIDI/memory upgrades), Yamaha DX7-II, Korg M1, Yamaha Clavinova, several controllers, drum machines, samplers and a bunch of modules. The funny thing is that I'd be working on a project and someone would say, "Hey, do you have this sound?" So I'd go to the music store and buy the piece that made that sound then never use it again! Because a lot of the stuff is older, it has limited value today except for collectors... and REAL musicians.
These days, I mostly play the Rhodes, Wurly and Baldwin for fun and never in public any more; the fingers don't have the dexterity they used to have!
Music has been generous to me. It has filled my life with creativity, interesting and challenging projects and a career. I've been very fortunate. Now I need to get rid of all this gear!