I pretty much got out of horses during college; got my M.S. and went to work for the federal government. I had the good fortune to work my way into a senior level technical specialist position in my field (ecology). So, I don’t make a doctor’s salary or anything, but have a solid, steady paycheck. Unfortunately most of it seems to go to vet bills rather than lessons and showing.
As far as my horses, I have two racing bred quarter horses that were $4k and $5K. Splashed out for a low 5-figures 2 year old warmblood a few years ago, but things went very wrong, and after many trials and tribulations I had to unload her. Ended up trading for another 2 year old warmblood, who is now coming four. Not the fanciest, but should work for my goals. I hope not to buy another horse for several years, but doubt I’ll ever pay over $20K, and more likely a lot less.
I’m lucky that my husband and I were able to buy a house during the recession, so our mortgage is low. We live in a reasonable COL area, and board for 3 horses is $1,000/month total.
For training, I cobble together lessons, trial and error, reading and online learning, so I don’t spend a fortune. That may change as I (hopefully) move the warmblood up the dressage levels, which would necessitate reducing from my current 3 head or biting into my retirement contributions.
About 10 years ago, I got disgusted with my farrier and taught myself to trim. That in itself saves me quite a bit of money per year on three horses.