I have some of the same reasons listed so far and some others.

EMs look good, even when turned off.

They sound good. Plus, you can turn on some rock and roll while playing pinball and the music and the game don't compete with each other.

They're affordable. High amount of fun per dollar spent, so great value.

That goes for repair and maintenance, too. Whatever is wrong with an EM usually doesn't require expensive parts to fix.

They're much easier to move. I can move EMs in and out of my basement by myself.
Not so with DMDs. (unless I buy an Escalera someday)

To me, they're just fun. Pinball is pinball. The same flipper skills are used as well as nudging and anticipation of where the ball will go. Properly shopped/refurbished, they are not slow. Or they don't have to be, if you pitch them right and wax them.

I've played SS & DMD games that were slow with weak flippers. Old games need some love to play well again, whether they are EM or SS.
Tired, neglected pin games ARE no fun. I'm looking at you, Cedar Point arcade.