I think the cost of the meals in the signature restaurants is quite high, thats why they are making you use 2 dining options. Heres a sample of a meal from Jiko, one of the signature restaurants requiring use of 2 sit down options.
Appetizer- Lemon-Cumin Marinated Ahi Tuna - with heirloom beans and "Zough" yogurt sauce $12.00
Entree- Oak-Grilled Filet Mignon - with macaroni and cheese and red wine sauce $33.00
Dessert-Jiko Sundae - three ice creams...vanilla, amarula and chocolate with meringue dots, roasted peanuts, chocolate sauce, malted whipped cream and chilled espresso $7.50
Beverage- Coca Cola - $2.50 (estimate, no price listed for drinks)
Sub- Total$ 55.00
Gratuity- $ 8.25 (15%)
Total- $ 63.25
Now 2 days of dining cost you 70.00 but you are also getting 2 snacks and 2 counter service meals out of that. If you allow about 8.50 for counter service and 2.50 for your snack x 2 that equals $22.00 take yr 70.00 minus the 22.00 and now it leaves $48.00. So you could technically get the above meal worth $63.25 for your cost of $48.00 a savings of $ 15.25. Bottom line is, go check out the menus and costs at wdwig and see what types of meals you would order then you will know if you can make the dining plan save you money or not. I'm having a blast preplaning the meals I plan to have with my pkg.