What is your "inexpensive" hobby that turned out to be expensive/ you gradually invested lots of money into?

https://sopuli.xyz/post/2837546

What is your "inexpensive" hobby that turned out to be expensive/ you gradually invested lots of money into? - Sopuli

Knitting. Only handdyed yarns, which are costly. And of course you need ALL colours. And only the most luscious fibres and yarns.

I’ve resorted to dyeing yarn myself - which opened up another deep, deep rabbit hole.

And a business.

Came here to also say knitting! Which also lead to me spinning yarn, which lead to processing my own fleece/fibers, then dyeing….just waiting for the day I decide to buy sheep and goats