One thing I have noticed in these comparisons between operating costs of self propelled scrapers vs. tractors and pans is that they are basing a large part of the alleged savings in the purchase price. The thing is, the tractor and pan does not usually have the same lifespan as the self propelled unit, so that throws the numbers out of whack.
If the tractor and pan is usually retired after say, 5 years, then it should be depreciated over that timeframe.
If the self propelled scraper is used for say 20 years, then it should be depreciated accordingly.
Myself, I don't know any long lifed pan set ups, but a 20 year old scraper is still a desireable, productive unit. Many are in use here that are 30 years old even.
Take a tractor and 2 pans for about 400 to 500K, and a 5 year life, get say 100K per year depreciation. (I am talking simplified version, not tax version)
The scraper at 1.5M for 20 years is 75K per year. When you look at it this way, it evens the playing field somewhat.
I'm not saying this is the end, just something to think about
Not sure what units cost 500,000 dollars, I will sell you new tractors and new pans for around 300,000.00, also have a large number of customers running 9 and 10 year old units with 10 to 14,000 hours on them. Units hauling 30 to 50 yards per cycle, and burning 10 gallon to 15 gallon of fuel per hour, compares out pretty well to self propelled scrapers or off road trucks when fuel is 4.00$ per gallon.