"Too much building and not enough selling" is very common. For example see how many of these failed projects blame a lack of marketing: https://successfulsoftwa

"Too much building and not enough selling" is very common. For example see how many of these failed projects blame a lack of marketing: https://successfulsoftware.net/2010/05/27/learning-lessons-from-13-failed-software-products/ https://successfulsoftware.net/2010/05/27/learning-lessons-f... But the right approach depends on your goals. If your only metric is money, then you should probably spend a lot more effort on marketing than engineering. But if it is a lifestyle business and you prefer the engineering, do a more than optimal amount of engineering. Just make sure you do enough marketing to pay the bills! I definitely agree about exercising.