...someone suggested to me that if we stay on site, the price includes entry to the parks for the whole length of your stay. ...If this is the case, it may actually be less expensive to stay on site then to pay for the accomodations/tickets seperately. Please help!
It sounds as though you are comparing the higher room rate for onsite with the lower room rate offsite and asking whether the difference in price exists to provide park admissions.
Sadly, it does not.
There are packages out there, which include park admissions, with your room either onsite or offsite. In both cases, they are usually more expensive than paying for each aspect of the trip individually. And an onsite room/admissions package will always be much more expensive than an offsite room/admissions package, when comparing similar onsite/offsite hotels.
Disney's onsite rooms are generally quite a bit more expensive than comparable rooms offsite. Onsite hotels do provide transportation to each of the Disney parks on a frequent basis (every 20 minutes or so). They are themed attractively.
Offsite comparable rooms will be cheaper. Offsite hotels will sometimes include one or two scheduled shuttle opportunities per day - perhaps to Sea World, Universal and/or Disney theme parks (sometimes to a central location, like TTC). Some also include food, perhaps breakfast or kids-eat-free in their restaurants. Certain additional offerings (golf & other sports, kids' clubs & crafts, gift shop, equipment rentals, etc.) may be less expensive or even free at offsite hotels & resorts. Then there is often the ability to upgrade the quality of your room to a more luxurious room or villa, for less than the price of a similar value or moderate onsite room. Hope this helps.