It all depends on what state. But pretty much all of them are on the same page.
1931 law in Michigan (Michigan Compiled Laws § 750.465) makes it illegal to resell a ticket above its face value price without the written consent of the event operator and venue operator. ..
Agreed, and those laws specifically address ticket sales. You know of any laws regarding private resale of food item? Though thats not my habit, I dont know of any. Scouts and youth groups do it all the time.