While I don’t think that ONLY serious buyers buy sight unseen, I’ve experienced the whole tire kicker thing first hand having a horse for sale. I’ve spent A LOT of time answering FB messages for people who are not actually serious. Asking me to reshoot a video 5 or 6 times, detailed conformation photos, specific extra videos, talking about past horses that looked like or were bred like this one, even setting up an appointment to see the horse, then saying you need to “ask your husband” is code for “I’m a tire kicker and have no intent to buy”
While I’d like to say I’ve already discussed it with my husband ahead of time, usually the first time he knows I’m about to purchase a horse is when I post photos on FB of me in another state with a trailer.