Some people are different. For example - I work a $10/hr part-time job for bills.

I could get a programming job since I have a CS degree and a few years development experience... but instead I choose to work a non-programming part-time job while coding my startup. I've been coding it for 6 months without showing anyone my demo. (it's a big project)

If I get investors this summer or not... I'm committed to "my vision" for the next 3 years. Bills aren't too hard to pay if you live minimally. (e.g. I don't own a cellphone)

"We act as though comfort and luxury were the chief requirements of life. All that we need to make us happy is something to be enthusiastic about." - Albert Einstein

"Bills to pay" or whatever your motivation is, does not mean that's the best way to drive business in a software company. Sales is a required part of business and one driver of how products are developed, but if sales were the only driver of how products are developed, products would be one dimensional pretty quickly with tactical "if you do this, I can make this one sale" types of development features. You still need a robust product management team that is (hopefully) looking beyond current sales needs.

Note, that's not always engineering, but sometimes it's hard to get product management looking beyond current sales needs, and therefore it does fall on engineering to do the strategic work.

IMO, it doesn't matter who does the strategic work, sales, product management, or engineering, as long as someone is doing it.

I have bills to pay too, but I try very hard to prevent them from being the motivating factor in my life. If I am living to pay my bills, then I am living my life in a wrong fashion. Creation is one of the most important and fulfilling activities that I know. Pursuing that activity for the sole purpose of paying bills seems to me such a great perversion that I would rather not create at all. Being paid for my work is fine and good, but working only for the sake of being paid? No. I would rather be poor.

(I imagine that this may be perceived as an extreme stance. To that I can only say: “It is no measure of health to be well-adjusted to a profoundly sick society.” - Jiddu Krishnamurti)