Actually, you're comparing apples to walnuts. This seller has the Creator Combo which includes the RC Pro 2. The sale you cited for $4000 is a Fly More Combo with the non-pro controller.
I was going to offer it up on eBay, but then realize how high their fees are for sellers, so decided to list it here first. The cheapest creator combo located in the USA that I've seen is $4650, so that's what I'm offering it at. Here's a copy...
I bought another one from S. Korea and it was delivered today. My intention was to have one as a backup, but my wife is gonna cut off my cahones for buying another one. So long story short, I gotta sell this one in order to keep the jewels. I...