The most obvious example of this in daily life is through airlines, where the difference is pretty transparent and you get night-and-day better service by being a loyal customer. With top status with AA and UA (EXP and 1K), you connected to U.S.-based very senior phone agents right away, who always make sure to take care of any issue that arises. 50min delay on your AA flight? No problem, sir, we are rebooking you on…
So if you aren't in the top tier, fly Southwest as much as you can. I do. All the same seats with minor differentiation possible. There are many reasons they have been the only airline to be profitable for decades, but having good service for everyone is definitelty one of the reasons.
There’s a lot of things I like about Southwest Airlines, but the lack of assigned seats negates them all.