Of course you can do it cheaper. For the bare minimum to become a cave instructor, after getting full cave trained and bare minimum amount of experience to meet agency standards, you can find someone to run an instructor course super cheap. Probably a couple grand for cavern through full. But that’s the problem. And people whose chose that path are probably the ones who sought cheap training to begin with, and will then offer cheap training, and the cycle continues to spiral down.How much for actual instructor training and how much because you were doing it for fun and bought stuff you wanted? If I were to take cave instructor training, that wouldn't cost me anywhere near hundreds of thousands of dollars, right?
I've seen instructors count every expense including their OWD training and dive trips they did as investment into their instructor carreer.
I look at every diving expense as an investment into my career. 8 different rebreathers over the years, multiple scooters, camera equipment, a new drysuit every 18 months, travel to various locations to build a more broad range of experience, and seeking out the best educators in the industry for my own education. It adds up, but it’s also what puts me in a far more comfortable position now that I’ve made those investments over the past 15 years. And now I can make a lot more time to do the fun/project diving for myself, which is also expensive, but adds more value to the classes I teach.
As for “dive trips” counting towards the overall investment, of course that counts. Just because it’s fun doesn’t mean it’s not building valuable experience. I think that’s the crux of the issue for a lot of people when they think recreational activities as jobs. “It’s a fun hobby for me, so it must not really much work for them”.