SCUBA, like many other recreational sports is expensive. Most have already said it - priorities, priorities, priorities.
Although my wife doesn't dive my son does so I pay triple. My son is just out of college and trying to get on his feet so I support his diving habit. Anytime I go diving, my wife goes shopping so I support her habit as well. When you don't smoke, drink in moderation, don't go bar hopping, and generally lead a boring life style, you can save for vacations and diving.
We also try to book our vacations (usually one a year) to someplace where both the diving members of the family and the nondiving member of the family can have fun.
Exotic vacations are great, but we do a lot of local diving as well. Yes, it mostly green water diving, but it's still diving. My son & I also volunteer at the Virginia Aquarium. It's shallowing confined space diving, but we get to dive, work on basic skills, hand feed the fish, and make faces at the guests. Most of all.... it's diving!