Hi Djla,
There is two elements in your question that I'd like to answer separately.
1) Is it justifiable spending that much money on just a hobby?
I went through that decision last year and for me the answer was "Yes". So far, I'm happy that I did it and enjoy myself a lot "up there". I'll see what the future brings.
Many hobbies are expensive, but quite obviously, leisure flying is an exceptionally expensive hobby. I used to think skiing was expensive but I now pay for an hour of flying what I pay for a week ski pass in the Alps. At this point in my life I can pull it off. I go flying alone maybe once or twice a month to stay current. Beyond that, I fly trips with friends and cost-share whenever there is a chance to. I realize that there may be phases in my life where I cannot afford this but nobody can take the experiences/memories from me that I am accumulating now. For me, that's worth it!
This is a question you are going to have to answer for yourself. That brings us to the second element of your question:
2) Can you make money from it?
Don't count on it. Even if you ARE going down the commercial route, it doesn't currently seem to be an industry to get rich in.
If you're not going down the commercial route, don't expect to make any money from it - mostly, because you won't be allowed to with a private license. I'm not entirely sure about this (others may have more details), but most instructors hold a commercial license. While it may be possible to instruct strictly PPL students on a PPL license with an instructor rating, I think this is quite rare and flight schools would shy away from employing you. Things might be different in a club environment.
In any case, don't make this a precondition for your hobby! Either you're willing to spend the money (and if you're lucky and perseverant, you may get some back at some point), or you're not. ;-)