Full disclosure: I didn't do my homework. I should have asked more questions about billing practices. Entirely my fault.
But: I asked for $400 worth of just pure cleanup to be done on my property, which was very badly overgrown with weeds, as I have been dealing with a family illness and unable to maintain it. It was admittedly not a pleasant job.
But when I received the breakdown for the work, it came out as follows: $240 for the work, and $160 for transit costs, gas, and "wear and tear". So a full 40% of the cost was for two guys to get there. For that money, I could have bussed both of them in from London, Ontario, and bought them dinner.
So do your homework.