This.
Sorry to insult those who plan on doing this, but the only reasons I see for doing this are:
1.You like to show off how much money you have.
2.You are incredibly lazy.
3.You have so much money to spend, you insist on spending it in the most ridiculous ways possible.
You are in, what many of us consider, the most fun, beautiful, magical, happiest theme park in the world and you choose to spend that time sitting inside a tent. Hell, forget paying $650 for this "add-on." You couldn't pay me $650 to do that. This is like paying for tickets to the Super Bowl, having seats on the 50 yard line, but deciding to spend even more money to sit a room upstairs so you can watch the game on TV.