LOL! :D
I have three basic angles when it comes to watch collecting. My main interest is in American Railroad-grade pocket watches - mainly Hamilton, Illinois, Waltham and Elgin, plus some US made WW2 military pocket watches. That's my collecting "mainspring", and I buy these very occasionally and only when there's something I really want - and, once bought, they're never sold.
As far as wristwatches go, I split these into 2 categories: (1) cheap-as-chips bits of fun, rarely more than £5-£20, which I can buy and sell as I feel like it just for the hell of it, and (2) good quality timepieces which I keep, ranging from US Gruens and Wittnauers to Swiss chronos - which I also keep. The Dugena is a nice 1970s chrono, and it's a keeper.
So, when I want to buy a "keeper", I have three sources of income:
1. I can sell a few of the cheapies
2. I spend part of my regular pension - but more usually:
3. I pick up my guitar, go out with the ceilidh band or to a jazz gig - and earn the cash!
Simples! I usually do a wedding gig with the band about twice a month, and get around £80+ for each gig. I stick the money in the bank and - lo and behold! Another chrono... :rock: