I agree but I think that’s where we talk past each other sometimes. When I think of trainers doing to much in horse care, I think of the basics - stall cleaning, feeding, turn out/bring in, blanketing, holding for farrier, annual vet check up - things that are known. I don’t factor in extras for “special needs” horses. Not because I don’t think it is important, just that it adds so many variables that it makes a cohesive discussion much more difficult. Like I cannot compare my horse expenses to yours well becaue my horse just needs a chiropractor as “extra expense” but yours seems to need a lot more.
I also think vet care is more commonly accepted as “extra” and generally speaking (though certainly not all the time) boarders are more understanding of paying extra when a health issue occurs. Maybe that is my experience also, as I never boarded at a place that held the horse for the vet or did extra health related treatment without an extra charge.
The one gelding at the place where I board now was purchased for $600 and needs nothing other than farrier care. The other one was about $10K to purchase but also doesn’t need anything. The mare and foal need more work and the foal ended up at the NICU. That’s a whole other discussion. It’s just so many extra details/cost of vet work/access to vet work (I live within 40 min of a horse hospital attached to a university but someone 40 minutes south of me lives an hour and 20 min from the closest facility like that so that’s a WHOLE other variable).
That’s why I try to keep - to “average horse” and “averae horse care” as much as possible - even that has it’s own variables (none of the horses where I am now wear blankets in the winter).