andrej - you are absolutely correct! The spreadsheet that I use accounts for many many other factors that I haven't proposed here, like checks retain longer, break even points based upon other variable and fixed expenses, etc... I feel one of the reasons ARS has been successful is this very spreadsheet which gives out business a guideline to operate from. Besides having the spreadsheet, we execute very well!
If that wasn't the case I would quickly post it for everyones review.