So I get the impression that the mustachian way of living is to try to cut down everything including your hobby and try to do everything free...
I think that's somewhat of a mis-characterization of the MMM idea. I think a better super-terse summary is "life style optimization". It's about taking the time to really learn about yourself: what
truly makes you happy, brings you the most fulfillment, gets you excited about living? And once you know those things, how can you do them the most efficiently? (Efficiently implies cost-effectively.)
But I'd like to ask how should one to judge what hobby spending is wasteful and what hobby spending is not? My take on that is that it depends on individual person. If certain hobby, i.e taking photos give someone great pleasure and spirit growth, as long as that person is spending dollars wisely, it is OK.. Is it the right path of thinking?
...
So I am interested in seeing how do you judge your certain hobby is bad and has to go and certain one is good and gets some allowance?
If you're truly interested in FI/MMM/ERE, I suggest you start by reading
Your Money Or Your Life (YMOYL). It's not without its flaws: the tone is kind of mushy at times, and some of the case studies are quite a bit removed from the average person. But the fundamental concepts and methodology are sound. In particular, understanding and actually
doing the sections on tracking and evaluating your expenses are critical to being able to lead an MMM-style life.
Basically, you look at money as "life energy"; that's a fancy way of saying that you have a choice as to how you spend every hour of your life. You have a finite number of hours in your life, so the obvious goal should be to maximize the number of hours you spend doing the things that make you happy and bring you fulfillment. The number of hours you have left before you die is your "life bank". Generally speaking, unlike a money bank, a
life bank only decreases over time.
The first part of the book shows you that your money is really just another representation of your life energy. Based on your
real income, every $1 represents some amount of time you gave up. Your
real wage is not your hourly rate, or salary divided by working hours: it's those things minus taxes, minus commute time, minus other work-related expenses.
Money is just an intermediate form of life energy. So the crux of the expense tracking and evaluation process is to say, for every purchase I made, "was it worth the X hours I spent earning wages to pay for it?"
Did you successfully cut out some hobbies that you thought was important to you only to find out you didn't miss it?
Some certainly do. Again, I think it largely comes back to self-reflection, and understanding what you value the most. Does every minute of every day of your life bring you maximum fulfillment? If so, and you are doing it in a way that is sustainable, then you're probably not part of MMM's target audience. But I think a lot of people, when posed with that question, know that the honest answer is "no", but at the same time can't conceive of making any real changes to their life. Perhaps you (and I suspect a significant portion of the population) fall into this category---that is, introspection and objective analysis of what makes you happy doesn't come naturally---that's where the process in
YMOYL comes in. It gives you tools to answer the question honestly and directly.
If you're completely unwilling to change, then this site is probably lost on you. But understand that all growth is change. Whether want to grow to be more like MMM, or to have more knowledge, or be stronger, or charitable, or more spiritual, lose weight, eat healthier, learn a new skill... whatever, it all requires a change.
And to make the change less scary, do a 30-day trial run. Try no sushi for one month. Surely you can do that. If it's the most awful, gut-wrenching experience you've ever had, well, maybe you can't cut it out. But I suspect you'd miss it, but not be miserable. And perhaps when you let yourself eat it after one month, it would taste that much sweeter. And that suggestion really speaks to another foundational MMM concept: delayed gratification. You love sushi, but what if you only do it once/month? Go back and re-read about
hedonistic adaptation. I hate to be cliche, but in short, sometimes less is more. I can't convince you of this any more than I can convince my child the oven is hot---she's going to have to burn herself before she learns.
I think another typical route for people on an MMM-style journey is to
try a lot of different low-cost/free hobbies. And they might find, their new free/lower-cost hobby is as good as (and therefore can replace) an old/expensive hobby. Here, you're limited only by your imagination. Outdoor/nature-type stuff may not be for everyone, but it costs virtually nothing to try. Start small and simple: find an out-of-the-way place to have a picnic with your family once a month. If it's something that everyone enjoys and looks forward to, congratulations, you have a new "hobby" that costs practically nothing. If after six months or so, the reception isn't as spectacular as you expected, try something else...