I make well below $75K (don’t own a horse). I wish I did so I could at least part-lease a horse. I’d also like to donate more to charity, pay for more things to be done for me I can’t do well myself and hate doing (like cleaning my house, which would employ someone). I’d like another pet or two and to travel more.
I’m not saying the happiest people are the wealthiest, but I could definitely find productive and useful ways to spend 2X to 3X that that weren’t just frippery.
Perhaps at the very highest level of the spectrum money begets the need to spend more money, like entertaining rich friends and maintaining multiple horses but I think it’s a bit silly to say (again, especially on a horse board) that everything over $75K won’t add to happiness.
Re: changing ideas–I remember being aghast years ago when I saw a rank beginner hose off a horse and turn him out in his field without scraping him, having it drilled into me this would just heat the horse up. Now we know it’s just a myth (and it never made sense to me), but I was aghast! (Admittedly, she also complained about having to pick hooves, so my opinion of her was biased).