I was wondering the same thing, sparky ...

As to playing solo vs with others, I've said before that one of the greatest musical experiences of my life was playing with the other 4 guys in our band in NY ... no egos, no drugs, no excessive booze, we and our wives developed friendships that are still going strong today even though I left the band to relocate 33 years ago ...
These days I play a number of gigs a year with the same guitar player in NJ, and if I'm lucky, get to play one or two with the sax player from the band ... here in RI I play mostly single gigs on the KB, but once in a while might have a gig with a local sax/guitar player ... and of course I do a good number of gigs as a vocalist with my female music partner ...
I really enjoy performing with other musicians, but accept the fact that most of the work at this point in my career is going to be solo ...
When I first started playing solo, it was somewhat traumatic not having my four buddies with me ... fortunately with the band I had worked on some of the 'business' end, so that wasn't new to me ...
I guess if I had my druthers, I would perform more with at least one other musician ...