Hey I keep asking myself the same thing.
Seems like when I'm busy working in the field, and then I have office work to do at night the customer service hurts. It can be hard enough to find the time to do bids, material orders, return phone calls (because you missed it working on a job), bills, etc. You don't have much time to work on marketing and improving your business. I know I could find more jobs to bid on if I was in the office. But I can't say if the improvements in operations, marketing, and bidding more jobs would pay for a J-man. It sould at least reduce my hours to something more reasonable.

Also a goal sometimes is to create a business that is self sustaining with little owner involvement. I think the first step in that is getting out of the truck.