It should be something useful to EVERYONE, not just bitcoiners. If you aren't budgeting your monthly incomes then SOMETHING is definitely wrong with the way you're spending money. Transparency and tallying data 100% helps in actually planning out your future years, regardless of how small your income may be. It just gives that sense of "Oooh, so that's how it goes" realization when you start seeing stuff after like, 4, 5 months of tallying data. Also helps you keep organized and planned!

And that's on top of the stuff OP said with relation to Bitcoin and investments.