I find that client work is even clearer with the risk-reward relationship, unless you're getting paid hourly.

OK, you'll pay me $1000 for this website, whether it takes me 1 hour or 1000 hours. So, which should I pick?

But obviously with (unpaid) writing, it's a hard lesson to learn that 100 hours on an article is worth 1000x less than 1 hour on an article.