I used an arranger to record more than 600 songs, mainly during live performances, so I could critique my performances and listen to where I needed to make improvements.
I also used the same recordings to create CDs for potential clients, which turned out to be a fantastic marketing tool. I booked lots of new clients and a large number of private parties from those CDs. Also burned recordings on to USB thumb drives for the same reasons. Some of the newer cars do not have a CD player, but do have USB drive ports for playing music.
Though I performed the nite club circuit for several years, I never made it to the top 40 list, or Las Vegas, but I did manage to make a decent living as a musician/singer/entertainer using my lowly arranger keyboard. When I did perform with a 5 piece band, I rarely made enough to cover expenses.
From my perspective, an arranger keyboard is a fantastic instrument, and in the right hands, can be used for any and all musical aspects. I have heard some of the best music ever that was created by skilled players using an arranger keyboard - music that would be considered as movie theme quality. Unfortunately, arranger keyboards and arranger keyboard entertainers get a bad rap from other musicians that in reality, are totally ignorant of what an arranger keyboard has to offer. And, for some reason, they don't seem to want to discover the features an arranger keyboard has to offer.
Just my .02 cents worth on this matter,
Gary