Nobody buys a saddle the way they buy a jacket. The rider is measuring a horse's back, arguing about tree width, and often booking a fitter before any money changes hands, which is why the searches that convert here read like specifications rather than product names: medium-wide tree, close contact, a seat size given to the half inch. The same customer will buy fly spray on a phone standing in the barn aisle, giving no thought to any of it. One catalogue has to answer both, and most tack shop sites are built as though only the second person exists.
Discipline is the dividing line the whole category runs along, and it is not cosmetic. English and Western buyers use different words for the same object, shop different brands, and read a page that mixes them as a shop that does neither properly. A hunter rider looking for a girth and a reiner looking for a cinch are describing similar equipment and will never accept each other's vocabulary. Aisles split by discipline rank for far more of the real language than a single accessories page ever can.
Demand also moves on weather and a show calendar rather than a marketing plan. Blanket season arrives in a week and empties a category; fly and sheet demand turns on a warm spell; show season sets when boots, coats and braiding supplies sell. Feed and hay behave differently again, being heavy, repeat, and genuinely local, which is the part of the business a national competitor cannot take and the part most tack shops leave hardest to find.