Personally, I have always hated the term "One Man Band"...but I guess, in reality, that is what many of us here are considered to be. Just don't confuse us with the "K" guys. Not that there's anything wrong with Karaoke...geez I am sounding like Seinfeld.
To play an arranger requires musician skills beyond loading discs. Most all the forum members I know here have varying degrees of accoustic piano skills and own and play arrangers because it adds full band dimensions you can not achieve on an accoustic.
Can an arranger be used in a band with other players? Sure! I worked in an oldies rock group two summers ago that relied on me for all the piano, organ, horn and string parts. The group consisted of two guitars, bass, drum, two singers and me. Not once did I turn the accomp on with them. (Incidentally, I used the PSR 9000 for those jobs -- but that was before I had the 2000.)
Who hires arranger players? You want names and phone numbers? J/K.
I can't speak for others here, but the people and places who hire me are the same as those that used to hire bigger bands I was in...but have found the difference in price and benefits between a 4-7 pc group and an arranger single or duo greatly favors the arranger guy.
I went arranger to survive. In our market, the 7 pc oldies group I mentioned could not get enough work to pay for groceries. And that doesn't even include other challenges of egos, logistics, rehearsals, etc.
Nigel, Tom C, Glenn and some others here do work with multi piece groups...and I enjoy that to. But, I make my living at this and never came close to working as steady (in the Florida season) or for as much $ as I can as a single or sometimes duo.
What prompts your interest Roy? Are you a player? Are you in a group or considering playing as a single? This forum doesn't discriminate. If you have an interest in arrangers..any make or model...and how to use them... this is the place to bookmark.
Eddie