I don’t believe there is a law regarding how much a ticket can be resold for. The state of New York requires that ticket resellers be licensed, however, The NYC govt page on ticket resale says “A license is not needed for selling tickets originally bought for personal use.”
Someone who is selling you a ticket they originally bought for their own use can charge however much they want, and you have to decide for yourself whether to trust them.
Also, I’m not a lawyer. I just did some light googling.
I could use a prince to save me from my prince.