You got me there...I used to do the spreadsheet thing...many, many years ago....my numbers are in my head I guess you could say....I know the fuel costs for sure, repairs and such, experience has taught me places to avoid and when I should I ask for a few bucks more because of the odds I might have to drive out a little ways...an extra $20.00 is actually more in a CV/Sprinter...and 20 here and 20 there adds up to adjust overall per mile pay "numbers". And I not immune to asking for the accessory charges..I know some people blow them off at times as trivial....if the customer owes me 15 minutes I want it....thats my time! I don't run a welfare organization here....its business...."... margin of error over 52 weeks?" I think you are more of a numbers guy than you let on.
You may not work spreadsheets like some expediters do but your financial instincts are clearly present and they work to produce your stated result. If that was not true, every expediter who is not a "numbers person" and did one's thing would end up with money in his or her pocket. In fact, those who pay little attention to the numbers and do their own thing are the ones that wash out.
Whether you are working a spreadsheet or not, financial reality applies. Those who do not align with it fail.
Bigger carriers have successfully in the name of competition literally given us away...and just slashed our cost of service. can you imagine a straight truck load on a Sprinter type van for the cost of a cargo van?.....Doesn't make sense.