Can we look at your math ?? Perhaps this is where I'm missing something. Since when is $4,500 a week a person's income based on $56 per hour ?? If that's the both of you, who is back at the shop working, still making signs ?? Does all production stop, when you're making $56 an hour ?? Hardly seems profitable.
It's sort of a how you look at it, kinda deal. If you could bill out $56 an hour for almost 2,100 hours, you'd be happy, but wouldn't you be happier at $85 an hour sitting in your shop doing what you do best, rather than being out there some 2,100 hours doing harder work ?? Then to boot, pay someone $25 or $30 an hour and keep 1/2 of it.
Someone is always in the shop. Yes, it is much more profitable for me to be out in the field slapping up some stickers and having others do what I pay them to do anyway. To answer your question, right now, I would much rather be making $115K a year installing signs. If I could make that much working for myself, just doing installs, I'd pay someone else less than half that to do my current job(s), and then still make money on my business. Or I could do both, like I do now. We work all the time, installs are scheduled when we have someone available in the shop or on weekends.
$56x40 hrs (you get paid for a full day's work if you show up for an hour or 8) x 2 people (myself and husband) = $4480 for a week's worth of work.