They do work a great deal and also spend lots of time performing administrative duties as well. Lots of paperwork, ferrying, demos, time spent getting company pilots up to standards, etc...
They also get to interact with CP's, DO's, CEO's, CFO's, and owners on a regular basis and may even fly with the company until the company pilots get enough time in the aircraft. Those who don't make careers out of this kind of flying certainly have unparalleled networking opportunities.
From an owners/operators perspective, an instructor or manufacturer's pilot in type would be an ideal prospective pilot for them.