Automobile tire manufacturers tried to FUD you into fear of repairing punctured tires in the late 1970's. Even got the Federal Gubmint to mandate "road hazard" coverage for all new tires sold. Rather than repair the tire cheap, tire dealers would insist on selling you a new pro-rated tire. A few would plug the tire if you insisted. Forgot exactly when but guessing this regulation was revoked under Regan.
Same happens with motorcycle dealers. Harley-Davidson is in the enviable position along with Mercedes-Benz, Porsche, and BMW, that their customer base dare not appear frugal. Many H-D riders are scarred silly if they see the wear bar coming close to the surface of their tire. I ride mine until I see the rubber change color. But I change my own tires so it can be done on the spur of the moment in an hour.
An inexpensive shop charges $50 labor to take the wheel off, mount and balance new tire, re-install. Many charge $100 each wheel. A friend forgot to ask in advance, carried in 2 tires purchased elsewhere, and was charged $300 labor. On a Yamaha at a multi-brand dealer.
Almost no motorcycle dealer will repair a tire. Why should they if they can FUD you into buying a new tire? And when a new tire is $100-$200 and labor is $50-$100 how much are you willing to pay in labor to save a half-worn tire? I plug the tire myself from the outside. With TPMS I know if trouble is brewing before I feel it, have survived punctures many times.
Will admit with self-repaired tires I sometimes have to add 2 PSI every week.