A good business person, who is growing his/her business in a businesslike manner should (and that's a key word) keep their margins the same, or very near - where they were at the lower level.
Big corporations have stockholders to satisfy. Stockholders want the corporation to make a profit - and a generous one that that. We too (as small businessmen) should follow that ethic. It's not how much money you make as you get bigger - it's the margins you make. If the margins are right, the money follows.
Additionally, large company owners (and I dare say I might qualify here), don't take out all that the company is making. I make (personally, myself) the same money now as I made 4 years ago, however my "retained earnings" have gone up because we have kept the margin in mind as we grow/grew. Retained earnings (equity) is what keeps companies from going out of business. Eventually the retained earnings get to a point where no one can take the business from you.
Prime example.... a company with tremendous retained earnings usually doesn't have much debt because they can pay for things on time, don't have to borrow much (or very little) to make capital expenditures - thus reinvesting in the business. Depreciation then becomes a function of asset management in order to increase the bottom line. Once you get to a certain size you begin running the business from a numbers standpoint, and as long as you hire proper people to ensure quality doesn't suffer - you're then running a successful business.
THIS is what SIMA is attempting to teach people. How to run a business, not how to plow snow.
Don't get me wrong..... staying small (relatively speaking) has it's advantages. However, being large (and profitable) means that you don't have to decide about whether or not to take a cruise for vacation and skip the Symposium. You'll be able to afford both without worrying about whether or not you'll have enough cash to make payroll.