I agree it's pricey, and there is no question that you could do the same trip for a lot less. And I'm not talking about RVing; you could do it for a lot less staying in the same hotels.
The Yellowstone/Teton trip does look like a good trip, but not the greatest value I've ever seen. One thing you have to keep in mind is that these prices
do not include air to and from Jackson, WY, so you have to add that to the trip price. For me, from Miami, that would be +/- $400 per person usually.
There are a lot of meals included, as well as a number of the activities you would want to do on that trip, but the lodging they are providing - while the best available there - is not that expensive. I checked the National Park Service concessioners who run those hotels and found the room rates at the hotels they're staying in at Yellowstone range from $106-192, mostly depending on view. Grand Teton is more expensive at $173-249, again depending on view. All of the above rates are
per room, not per person. They would be paying less because of the group discounts.
Also, for a
guided tour - which this is - a lot will depend on the local knowledge of the guide and the quality of those activities. I have some reservations about the local knowledge part. For example, I would love to take that ferry across Jenny Lake to Yellowstone National Park - that must be some ferry! Jenny Lake, which I've backpacked on, is a small lake in the middle of Grand Teton. It's nowhere near Yellowstone, in fact, it's about 30 miles away! That has to make you wonder about the local knowledge, as do some of the other descriptions.
I can see paying extra for the magic at WDW, or on
DCL, but I wonder how they will differentiate this offering to make it worth the price. Obviously they've done some market research, but before I signed on the dotted line, I'd sure check other options. It's not like Disney is the first company to offer tours to Yellowstone or Hawaii.