It is true you will not find cooking accommodations or individual 3 BR units inside the park in their lodging options, but for the VALUE, you cannot beat the Roosevelt Roughrider Cabins.
I know not for everyone, but this past summer I had one of their 3 bed/sleeps 6 cabins. For just 2 of us it was $76/night. Had we had the max of 6, I think the price would have been around $120 (including taxes) which works out to about $20pp/night. Now that is a great value!
The Roughrider Cabins are aptly named. This is the description from the NP website:
Roughrider Cabins
Rustic cabin units are sparsely furnished and heated with wood burning stoves and typically contain two beds and are all without bathrooms. Communal showers and bathrooms are located nearby. Two "Presto" logs are provided for use in the stove.
Estimated Summer 2013 rate* = $72/night
Frontier Cabins
Frontier cabins are simple yet comfortable cabin units typically with two double beds and with bathroom with shower, toilet and sink.
Estimated Summer 2013 rate* = $120/night
*Lodging rates are per night, for up to 2 adults and do not include tax and utility fee. Most rooms available online allow 2 to 4 people per room. Larger room sizes may be available.
From the WM West Yellowstone table of credit values:
WorldMark West Yellowstone, MT
1 Bedroom with Full Kitchen, sleeps up to 4 (at $0.07/credit/night)
Mon.-Thurs. $74, Fri.&Sat. $171.50, Sun. $91, plus 1 housekeeping token/stay
3 Bedroom, 2 bathroom with Full Kitchen, sleeps up to 8 (at $0.07/credit/night)
Mon.-Thurs. $112, Fri.&Sat. $220.50, Sun. $126, plus 1 housekeeping token/stay
There is much more to "value" than the dollar/night cost. For a family of four, who want their own private bathroom(s), the value of WM is clear. Plus, much of the value for us at any WM location, is the $150/day savings by cooking our own meals, versus dining out every day.