If I had the money to hire someone, I think it would be a business manager instead of a physical worker. I would let him or her, do the sales, marketing, call backs etc. while I take care of the quality. I tend to charge less cause I think it's easy and then end up wishing I charged more. Having someone else do the sales who is not afraid to price right would be awesome .. Just my thoughts anyway.
Also, a stick edger in areas that have concrete edges and bed lines that need be well defined is a million times better than using a wip that can fling things into windows or your face... maybe not faster but way better quality even if you think you do good with a wip, again just my opinion.