I don't understand the equivalence the author is ultimately making in suggesting that creating something with polish is expecting to make money (and fame) from it. Yet notice all the things in the blog post are creations that are exposed to the internet (photography blogging, releasing a program online, making a website), rather than private, non-published hobbies which literally have no audience.
Some prefer to make things polished/more complete as they want others to enjoy something more and polish makes it more accessible/usable/meaningful, or because it's a reflection on them (whether using an IRL identity or even a pseudonymous one) and part of their enjoyment of the process.
Since we all know the audience is whoever will come across it, once something is released in the wild. Might be an audience of one, or many. Which isn't to say people need to care about the output of hobby but I disagree that money/fame is the only motivation in improving something.