I agree with your post only that fixed expenses go up with a growing company.
Yes the variable....say the amount of salaries in a months time will flux a good bit and continue to go up with company growth.
However, fixed expense can too with the growth of a company. Its just that the expense of that item or service remains the same but more of it may be needed with the growth of a company.
Lets say there is a calibration unit that cost $400,000 used on some of their products. Well, there might be a loan that is the same cost per month....yes fixed expense. However, with growth there are new fixed expenses...you might need three of those calibration units and now you have 3 loans at a fixed expense...
just sayin...