That's easy to say except for those tourists who hardly know anything AT ALL about the parks.
On my recent trip to Disneyland... You know how Disneyland Park and California Adventure's entrances are like... Right across from each other, walking distance? This japanese family came up to me while I was waiting for entry into California Adventure
(We did Disneyland the day before) and they asked me if this was the entrance to the theme park. I told them that there are two theme parks, and they showed me their ticket. Their ticket only lets them go to one park, so I sent them over to Disneyland Park for the better experience.
But it's like... What if you have tourists from other countries who don't know that there is more than one theme park. Heck, most of my friends think that Disney World is JUST a theme park! So I have to disagree and say that there should be a reduced price on one of the sides..
Phew. Not sure where that all came from but there ya go!