“The customer is always right.”

That’s a business model to adhere to.

But sports have chosen one provided by circus impresario P.T. Barnum:

“There’s a sucker born every minute.”

Sunday’s game between the Pirates and Milwaukee was supposed to be a classic pitching matchup: Paul Skenes vs. Jacob Misiorowski. Misiorowski dominates. Skenes used to.

Skenes hasn’t hit 100 mph this season. Misiorowski topped out at 105.5 mph on June 27.

It felt like before vs. after. A challenge to Skenes.

It made me buy a ticket.

Then, less than 24 hours before the game, Misiorowski got pulled from the start. “Arm fatigue” was cited.

It’s a classic example of bait-and-switch. (Disclaimer: The ticket doesn’t promise anything besides the game.)

Did Misiorowski legit have arm fatigue?

Who knows? He cracked 100 mph 57 times in a game earlier this season. It’s amazing Misiorowski’s arm doesn’t fall off.

But disappointing the customers occurs too routinely.

Pitchers get pulled deep into perfect games, most recently Jared Jones after six perfect innings at PNC Park last Wednesday.

We had a shot at a Skenes-Shohei Ohtani pitching matchup last month at PNC Park. Didn’t happen.

We could have had Skenes vs. Tarik Skubal last year at Detroit. Both went on to win their league’s Cy Young Award. They idiotically pitched opposite ends of a doubleheader.

A plethora of big names have pulled out of Tuesday’s MLB All-Star Game. Some hurt, some just because.

Misiorowski and Skenes won’t play. Nor will Ohtani and Aaron Judge. Why bother having it?

Laziness disguised as “load management” got pioneered in the NBA. It’s an absolute crock.

UFC 329 on Saturday provided more evidence: Ballyhooed as the return of Conor McGregor after a five-year hiatus, McGregor lasted just 69 seconds before succumbing to a knee injury.

It was the opposite leg of the one he hurt five years prior, so at least the customers got variety.

UFC 329 drew the largest live gate in the company’s history at $25 million.

Was McGregor’s knee hurt going into the fight? That rumor is making the rounds. He looked unsteady on his feet just prior.

One thing is certain: Refunds weren’t offered.

It’s a blight on the paying public.

Except the public keeps paying.

There were 34,087 at PNC Park on Sunday.

Nobody seemed perturbed by Misiorowski chumping out, especially when the Pirates had a 10-run fourth inning and posted a 14-5 win to complete a sweep of Milwaukee.

That might not have happened vs. Misiorowski.

I was in the middle of the crowd coming and going and I heard nary a peep of complaint.

Barnum was right.

In fact, he likely underestimated the frequency.