Because a substantial portion of HN considers all parts of a business, besides the product, a waste of time. Marketing? Finance? Human Resources? That's for the plebs who can't program. Meanwhile, this place consistently features debates conflating balance sheets and income statements, revenues and profits.
Seriously, if you a considering starting or running a business, and don't understand the foundations of book-keeping as laid out in this tutorial, you should feel bad. It's not like you require a two-year diploma; understand the basics.
My father is an architect and home builder. After building his first two homes after college he made almost nothing. He went back to night school and took financial accounting, real estate/broker courses and sales courses. He's more a business man than an architect.