If one chooses their hobby wisely, the "stuff" may not that expensive. A boat hobby requires a boat, trailer, and a vehicle capable of towing both. Then there's the insurance, life jackets, maintenance, storage, and of course, the fuel used every single time you go out. It's easy to spend a lot to get started, and a lot to keep it going.
I was thinking a kayak, a canoe, or perhaps even a small sailboat. One can enjoy getting out on the water with not too much money.
... On the other hand, I have spent about $5000 on my music hobby to purchase instruments and amps, but after that initial outlay, I have no other ongoing costs other than $50 - $100 a year on strings, cables, maintenance, etc. To pick up my guitar and play for 2 hours costs nothing. To go to band practice or jam at a friend's place costs only the fuel to get there.
I totally agree with you. If one is really into something, an investment of $5K-10K which lasts decades is really cheap.
I recall my life-long electronic hobby. Starting from my teenage years, I did not have a lot of money, so bought used electronics from salvage yards to get parts to play with. I now have expensive bench equipment (left-overs from a failed startup), but have grown a bit tired of this. Modern electronics are not really amenable to do-it-yourselfer hobbyists. But I digress.
Travel may not require much "stuff", but it requires money to get there, money to stay there, and often money to do things while you're there. It can be done inexpensively or expensively, but every trip costs some money.
Yes, travel costs money. But even here, as I look upon travel as an adventure (but not as much as a trek across Siberia or the Sahara
), I have found that with more modest means of travel, I get to experience the local scenery more. A pedestrian sees more than a rider of a limousine. So, frugal travel has brought me countless fond memories. I spend just enough for creature comfort, and while this means no hostels, it means no luxury hotels either.
And then, there are people who combine travel with living. One of my favorite blogs is "Kevin and Ruth". These people are real travelers, while I am only a tourist. They spend much less than I do, yet see a lot more.