I definitely suffer from expensive obsessions/hobbies.
I started collecting coins from circulation around 1958. Later this morphed into collecting older (expensive) US type coins. Eventually, I became more and more interested in US Gold coins (even more expensive). By the time my main interest switched over to pre-1834 US gold (horrendously expensive back then in 2000, and out of sight now), I realized that I needed to find a new hobby.
I had always been interested in Photography -- the big problem was film. Fortunately, around 2000 digital photography started becoming feasible, and by 2003 I had my first digital camera. In 2004 I got my 1st DSLR, and decided to switch hobbies from coin collecting to digital photography. This was expensive, but nothing like collecting gold coins.
Unforunately, there was a lunar eclipse in the fall of 2004, and I just had to take photos of it. On a whim I swung the camera around, and took a picture of Orion. Maybe you can see where this is heading. The results were good enough to get me hooked on astroimaging, which is an order of magnitude more expensive (and difficult) than regular photography. Eventually this lead to me getting a "summer cabin" up in the Catskills (dark skies for imaging) -- hence the name Semikaatskillian. At least I paid cash for the place, so I'm not saddled with mortgage costs.
Of course, for astro, you need telescopes, and manual focus lenses (AF doesn't work well for astro). After getting a few lenses, my old collector instincts were rekindled, and I became addicted to collecting manual focus lenses, and eventually old SLR cameras that use them. All in all, still cheaper than gold coins, though.