Yea, foreign tourists are going to get on a plane to St Augustin, Tuscon, and Asheville from NYC for a trip, rather than seeing one of the three biggest waterfalls in the world on a bus ride. It's a 7 hour bus ride that leaves from Midtown in the morning, does lunch at the border, a quick boat ride, a walk around, and then a bus ride back.

They're just gonna be like, "hey I'm doing a US trip to NYC and SF, let me just jam in a hop over to Montreal including border control and a quick pop over to Cancun (where flights for in demand times are 1200 dollars or more) and then a bus to Merida with two kids with a single entry visa. I'll also time a red-eye flight to New Orleans for super cheap, because my once in a lifetime trip to NYC is PERFECTLY timed to check out a cheap flight to NOLA, and I'm sure there won't be any flight delays for my connecting flight back to Korea that would be at my cost if I missed it."

Mostly they just do NYC with day trips to Niagara Falls and DC, and then SF with a day trip to Napa maybe, or LA to SF seeing Big Sur. MAYBE they do Chicago, but really unlikely, and if they have kids maybe Disney. Nobody is going to second tier cities or tiny college towns like Portland, Nashville, Memphis, Asheville unless they have friends there or they are like huge Elvis or Dollywood type fans.

People are FAR more likely to do nature trips as well then some small city...Niagra Falls, Grand Canyon, Yellowstone, Yosemite. It's like you only travel to cities and stay in hostels and aren't seeing what people actually do.