I pay percentage as well, usually 50/50 so if we're getting 600 mbf I get 300, then trucking runs around 300 per load, 4k average on a load (self loaders) =1200 ish, daily if I work hard enough, but realistically every 2 days
My costs are mobilization, which has never been over $500 total (skidder and excavator about $60 for just the skidder), fuel 30 gallons every 2 weeks of off road, and 30-60 gallons every week on road, average price of $250 every other week, for all vehicles, private included. And insurance around 2k a year, so what like $37 a week, If I run the dumper truck its considerable more, since it gets lousy mileage, and runs like crap on anything but premium, but then that is more or less treated as a separate entity, and billed into each load of rock/dirt I haul.
all told per week I need to make 400 to cover cost of doing business ish (less repairs). If i get 2 loads a week I make $2000 after expenses. If I push and get 4 I only burn a little more off road diesel, but make well over $4000 a week.
Problem with pushing harder is that I am gimpy already, pushing things that don't work well makes them break more, and then I'm stuck healing for a week. So I work at my own pace, running is not my forte.