That is my interpretation as well. Costs vary greatly by region and general COL for that region and everyone who lives and/or operates any business based within that region. Comparing what costs are where you are with what costs are somewhere else is a moot point unsuitable as a base for comparisons and judgements.
IMO OP did make a typical novice mistake. One many of us have made in our journey with horses. Never ASSume anything and trust but verify.
IMO trainer assumed you would accept whatever you were told and you would never “look under the hood” and would not know what you were looking at if you did. That is where you did not do your due diligence because you just did not realize what things really cost.
It is a shame trainer did not attempt to educate you on what you are signing but the amounts here are, as noted upthread, are not unusual and are in the best interests of this 25 year old horse. I do not think a CIVIL conversation about disclosing all expenses you are expected to pay will get you blacklisted. Schedule a sit down talk ASAP.
Be aware there are other trainers out there who do take the time to educate their clients is such things and clearly disclose required actual costs in a “Free” or “care” lease. There are other lease options out there such as Half Leases where you get 3 days a week and month to month leases that leave the majority of the vet and farrier costs to the leaser, are pro rated or split.
Might be in your best interests to explore other options. You are paying a premium price for a safe near retirement Oldster who has no lead change.
On the saddle, it is a good brand and you need one, if you can afford it go on with it but there are other options and other top trainers who endorse a saddle but do not require all clients buy and use only that brand. As has been mentioned, your lease will be up before that saddle shows up. Just my opinion here but I would not renew the lease on this old trooper who has already outlived the majority of his classmates and deserves a softer life for his few remaining years. IMO. And you can do better for that amount of money.