This breaks down as soon as you have dependencies, e.g. a family, as you can't simply abandon your source of income. But aside from that, just because it takes

This breaks down as soon as you have dependencies, e.g. a family, as you can't simply abandon your source of income. But aside from that, just because it takes a couple of years to grow a business into profitability doesn't make it not worthwhile, even if you have to put in a lot of work during those years. A large customer with an gradual payment system based on accreditation would be such a scenario. Of course it's incompetent to cling to an unprofitable undertaking, but there are valid reasons for working overtime over an extended period.