Back when I was racing, I reckoned I sailed 100 days/year minimum. For every hour's sailing (whether training or racing) there were several hours of travelling, bimbling etc. It was great fun, but it was pretty much my life.
Now I'm racing bicycles, probably at a comparable level. Still have to drive to most races, but I can ride to some. Not only does training start the moment I get out of the door, but I can do it on the way to work; yes - I get two hours of training for free, every day, just by riding my bike to work. Total cost is about 10% of what I was spending sailing; I could probably replace all my race bikes for the money we used to spend on sails in one year.
Fundamentally, for me, racing boats was fantastic when it was the only thing I cared about. Now I have other responsibilities, I need something I can fit in around the more important stuff. That either means sailing a sheddy old Laser at my local club every Sunday morning, or switching to a sport that's less demanding of my time/money, and still being good at it.