Still running on the same bike 10 years after I bought it new. Most of the farkles I bought for it, I got within a year of the bike purchase. I don't own a single article of cycling-specific clothing or footwear. I spend less than $25 a year on maintenance/replacement parts, averaged out. Still very happy with that bike!

A couple years after getting that bike, I spent $75 plus another $25 in parts to fix up a used CL bike so I have a spare in the event my main bike breaks for whatever reason (and to lend out for group rides).

So I'd say over the past decade, all-in, I've spent maybe $1500 on cycling. I don't imagine that figure will jump significantly in the near future. More than many folks have spent on the hobby, but a lot less than others.