Spinner/Weaver/Fiber Artist here.
I "only" have 3 wheels. One handed down in the family, one purchased new (pre-mustachian), and one bought for way less than I can sell it for.
As a side-gig/post FIRE hobby, I buy, rehab and resell looms and am branching into spinning wheels. I also recently sold some of my weaving for the first time. $450 in the bank. Score!
I keep my fiber costs low by stalking craigslist and dead weaver sales. I also make many of my own tools. Like just about anything else, you can spend a lot or keep your costs under controll.
Case in point: Last year I took my visiting sister to a LYS. She dropped $200 on a small bag of yarn and needles. I winced but let her enjoy her find. The next day, after dropping her off at the airport I followed up on a craigslist ad and wound up driving home with my van packed to the top with yarn and books, all for $500. Sounds like a lot but I sold half the books for more than I paid for everything and now have years worth of yarn to enjoy.
Waves hand wildly in air - me 3. Only 2 wheels though. Read SF before it was respectable ;-)
I am not sure spinning is mustachian though, all it has done for me is given me an appetite for more expensive fibers - merino/silk blends, merino/alpaca blends, etc.
I'm a handspinner (make yarn on a one of four spinning wheels), and I've been a sci-fi geek since 1977. The dichotomy amuses me.
I've had a different user name since the days of AOL, but like others I really didn't want it linked to my financial life.
I am also a handspinner (won't talk about how many wheels I have) and love sci-fi!!