Many of the acts that play the casinos here request B3s with their backline requirements. My friend at the music store has several and he sends a truck with two guys, leslies, dollies, etc., and has everything all set up for them.
You'd be surprised how many still request DX7s!
He makes more off one backline setup than he would in six months of selling arrangers at the price he has to make them now.
Wow! He is doing very well. Having the stuff there all set up for you is far better than lugging a big 425 lb. Hammond B-3, or the even heavier C-3, which is why most touring groups have such requirements at their next venue.
Some players do carry a real Leslie to run their chosen clonewheel through, the former is usually boxed and mic'd.
DX-7's are especially popular with groups doing 80's music, as there was hardly a song during that era that didn't have the ubiquitous DX-7 E. Piano or the DX-7 Bass featured in the mix.
I've got oodles of DX-7 sounds on my Tyros4, including several realistic versions of that characteristic, and somewhat overused Electric Piano, and they still come in handy for certain tunes.
Ian