Businesses have a right to sell products to make money!
I love both parks, not only Harry Potter, but the many fun things they have to offer and I'll always have a 14 day multi park pass when I visit so I'm have no problem with it.
Actually Disney is doing the same when they offer a Be our Guest restaurant at MK and a meet and greet at Epcot or a Little Mermaid ride at MK and a show at Disney Hollywood Studios or a Nemo show at AK and a ride at Epcot. But you have no themed ride between those parks to make it a complete fun experience.
But, I have real questions about this thing having a 4 hour line for a 10 minute train ride. There are so many red flags this thing is throwing up for me. The first of which is the loading procedure is sure to be slow, especially if they have some sort of ticket check (to make sure your ticket allows you into the other park), and with the fact tat this ride will be immensely popular. Next, how many trains will they run? My guess would be 2 riding on the tracks, while 2 are loading (one in the Hogsmeade loading station, one on the way to London, one in King's Cross, one on the way to Hogwarts.) But, if I am right, then each train will likely be slow, and the "turn around" time might be a few minutes (as each station is rumored to have a turntable to turn each train around for the return trip.)
I have faith that this will not be a huge mess in the long run, but Universal is trying something that no one has tried before, and I don't know how this will all work out. I do think it is a fantastic idea, one that I love, but man, there are so many questions on how this thing will actually work...
I propose a train restaurant where the guests can get the equivalent of a fastpass and they can enjoy a nice beverage or lunch, on their dime of course. Or they board a bus that will return them to London. Ooops, train ticket rejected. Go back to London.
The last alternative is a walking path to New York.
Perhaps they should only allows park to park passholders to go at first to prevent overcrowding. All train passengers must upgrade. Bummer for those who are too cheap or poor.
Has anyone heard how many people each train will hold? I have seen the train sitting on the tracks and they do not look that big to me but I could not tell how many people they would hold.