How much do they make???
By process servers do you mean the company or the server themself? I've had people served for $50 per service. You've got to CC all the counsel of record etc. I don't know what portion of the $50 went into the pocket of the person who physically served the notice.
I mean doing it as a company, but I would also serve the papers myself, therefor keeping most of the money.
Like I said, I remember as a clerk working at a firm I sometimes had to serve motions on all the people we were required to serve. I remember it costing something like $50 for each party. How much the company keptt and how much they paid the actual servers I don't know.