I live in central Illinois and we go to disney at least once a yr and have never gotten a code.We have always payed full "rack rate" to stay on property.
I have talked to several CM over the yrs about how discounts and codes are sent to people.This is what I have been told.
First, the pin number post cards and email pins are done through marketing.Not through the central reservation sysytem.Most times the CM that is booking isn't aware of the discount until she imputs the pin number. Second, we went on a DVC tour and were told the Illinois(mainly the chicago and suburb area) were the 3rd largest state to visit the WDW area and buy into the DVC. Thats why they set up the Shamburg door to the dream in Woodfeild mall. I think this has something to do with why there are so little pin codes around Illinois area. Families like mine who visit disney on a annual bases will go to WDW regardless if we recieve a discount or not. So it makes sense from a buisness standpoint not to send me a pin or code discount.
With all that said I would LOVE a discount and keep hoping that one will come my way some day.