Another consideration. Should the business plan be a document that is focused on selling an idea for a product or service? For many years I worked in a company that did not want anything in a business plan that could be construed as showing a bias towards or against a project. The mantra was to only present facts in the business plan. The Operations Research Department was there to review the analysis as being unbiased. To handle the "what if" scenarios or sensitivity analysis we prepared a supplemental analysis documents which were mostly financial oriented. Personally, I like a factual approach and use the presentation of the final document to point out the conservative aspects of the content.
What's more important, sales or profit? Profit is what generates your salary. You could actually make more profit with less sales. Less sales could actually be less work. The most important thing for a business is to make money. That's profit. Now some might say, I don't care so much about making a lot of money. I like the freedom of owning a business. Well that is probably true, but if you don't watch your profit, you might lose that freedom. It's always amazed me how most businesses, even very large ones, talk about how much their sales are. You hear comments like, that's a บꯠꯠ company. But what's a บꯠꯠ company if it has no profit. Now I do admit that 2% net profit of บꯠꯠ is a lot bigger than 2% of ũꯠꯠ but most likely the large one carries a lot more headaches too.