I think that your numbers are off.
If you go to Disney's website and plug in 4 nights @WL in late July (std. view) for 2A/1C, 4-day MYW base tickets, the price comes up $1746. Assuming that these rooms will be included for those dates in the extended 4/3 deal, that's the price that you would pay for 7 nights/7-day MYW base passes.