I said I would never be a cave diver as little as 5 years ago.
It was not that I didn't want to be a cave diver--I just figured it wasn't in the cards. I had not been doing technical diving long, I live in a state with no cave diving nearby, and I was getting on in years. I also figured that my lack of proximity to caves made taking the necessary trips for training and diving too difficult and expensive.
The first thing that changed was my wife and I both retired and decided to spend a month in Florida each year. I decided to take some classes. I already had a couple of years of technical training under my belt, and I was used to trim, kicks, and doubles, so my training went faster than it would take the average person. (It was still no zero to hero experience.) I was also shocked at the price. I got a package deal from the instructor that included lodging. When I did the math, I realized that an average day (with lodging) of intense cave diving training cost me less than an average day (including lodging) of 2 tank boat dives on the Hawai'ian vacation I had taken the year before. I figured that even if I never did a single cave dive after certification, it was worth it.
What has only recently dawned on me, showing that I was not an economics major, is that typical cave diving is way cheaper than typical boat diving and especially deep decompression diving. This makes my trips much more affordable than I had expected them to be. I have therefore already been able to accumulate far more post certification cave dives than I ever thought would be possible, given my advanced age.