Limited to 25 dollars? Maybe with a student card but typical cards have a 50 dollar limit for tap paying and "black" cards have a limit of 100. I am not sure you should be bragging about a possible security flaw in the American implementation if you have no limit on payPass. The limits are not a technical limitation but rather for consumer fraud protection.Except you lose your rewards points because your bank isn't involved, it uses a virtual MasterCard credit card.
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Our cards and terminals do too, and ours has no limit unlike the Canadian ones that are limited to $25.
I just paid a $244 car repair bill with payPass, nothing new. (this was before Apple Pay)