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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Now open source you work, and help future people!
Um, how? I've strapped physical electrocal devices and petrol powered motors together. Nothing I've done is unique, I hold no IP or copyright and anyone can copy it.
If you mean show others - then sure, I've done that!