If anything I'd argue kids is the sacred cow here. In terms of a horrific expense, stress, with little return. What little mention I've seen of pets and travel are pretty scrutinized (but I haven't really looked though).
Anyway. I think much of the point here is to point out possible ways to save, make you think about your choices, consider alternatives, and then it's up to the individual to decide whether to do so. Maybe I'm wrong, but I don't come here for some recipe for what to do, point by point.
I don't know the specifics, but regarding the powersports example I could imagine people asking whether the joy you derive is worth the high cost, or if there are cheaper alternatives that give the same. Of course it's your money and you can do whatever the hell you want, you don't need approval from random people. It's just suggestions, and might make you think. It certainly has for me on several occasions. "I thought this would make me happier, but would it? I think I'll do X instead"
Personally I would love to have a jet-ski, I'm sure it's awesome! But it's expensive, and a hike in the woods, or trail biking or whatever is cheaper and gives me exercise so I'll do that instead. Just an example. But if you want a jet-ski nobody here is going to stop you, but I retain the right to not approve. In the same way you might not approve of my choices, let me know, and make me think about them.
If you want approval there are plenty of jet-ski, or computer hardware or whatever forums where you can get approval and admiration for every purchase you make:)