What is your "inexpensive" hobby that turned out to be expensive/ you gradually invested lots of money into?
Edit: so it turns out that every hobby can be expensive if you do it long enough.
Also I love how you talk about your hobby as some addicts.
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House plants. Sure a few mass-market plants are dirt cheap, but soon you get into unusual plants, plants with special needs, hundreds/thousands of plants, grow lights, grow racks, terrariums, automated watering systems…