Look at this way HC, say you were going to do the job for $1000. You have the same material costs (lets say $200 for arguments sake)

You both go on 4 estimates - each estimate costs you $50 in real money (direct labor, etc)

They sell 1/4 - $2000 - $200 mat - $200 est cost = $1600.

You need to sell 2/4 to get the same gross, but your costs are like this:
$2000 -$400 mat (u did 2 jobs) - $200 est cost = $1400.

Now, they are paying for 4 hrs labor (for arguments sake), but you are paying for 8 hours labor (remember you did 2 jobs)

Don't disregard overhead either. Who has the higher overhead?

At the end of the day, who makes more money? Who did more work?

again, look at Nexstar or ESI and you'll find most of the answers you are looking for.