Who gets 3k for a van wrap? If you include design I'd believe it.
$600 in material costs are accurate but you have an investment in equipment and have to maintain it, ink, waste, building and utilities, a color proof, and sales time to sell the job. Then add the labor to rip, print, laminate, and trim your prints. All that equals another $600 leaving you will $600 in profit. Install prices will be in the $600 - $800 range with approximately half profit. If the job goes well you could probably take close to a $1000 dollars out of the business, but you should be investing some of it back in the business for advertising, training, new equipment and growth.
10 years ago I was making $42,000 + health care and 15% of my salary in a Sep IRA. 2 years ago it was $75,000 with no benefits. I did more than just wrap, I was in involved in every aspect for all types of sign work in Kansas City. Obviously big cities are going to pay more than smaller cities and towns.
I have met owners who pay their installers like subcontractors. They were paid on the books but a percentage of what the job was worth based on their speed and quality. The owner used this method to keep them motivated even when they were working long hours or and or nights. Some of the installers made over $100k a year. I didn't ask but I am sure there was a lot of overtime in that 100k.
Some how you have to continue to grow your business so your best employees have room to grow and you have to compensate them or you may be competing against them. Whether they take their knowledge and connections to your competitors or strike out on their own, it doesn't make much of a difference.