This is a good point. Here's something I've found when arguing about similar things:
Some people define "work" as "unpleasant tasks I do to get money," and by this definition I support the OP. Minimise that crap, get it off your plate entirely if possible. These people would never consider a book that they wrote or an app that they made as being real income, even if it eclipsed their other income, because it was fundamentally done out of a sense of fun rather than work.
If you don't think of work in those terms, your argument is true. For instance, I would much rather do an extra hour's work than to save twenty bucks by shopping at an out-of-town supermarket. An hour's work is fun, wading around a big soulless store for an hour is not fun (this is a personal comparison, you may disagree).
This is where I think frugality is overplayed as a tool for personal liberation; instead of finding yourself liberated from money by abandoning the rat race, you tie yourself to it in the piles of bookkeeping and pleasures denied that are the province of the penny pincher. But this wasn't the point that the article was making anyway, rather it seems to be advising to think clearly about what you want, and choose things that will last more than six months.
So yeah, what was the point I was making? Oh yes, moderation is good. I'm not qualified to make any of these statements, I'm hardly an example of good financial management myself. But I've been typing for too long not to hit the reply button now.