It's similar to the Canadian Provinces not being a part of the "SCS" . . . they are part of the PCS (but get a spot allocated for Nationals for each Province because I've refused to call it the North American Championship).
We also have the Washington "DCS", which allows Washington DC representation at Nationals even if they aren't technically part of the "SCS".
Here's the plaque plate for the Washington DCS Champion:
They will be subject to the same $1 fee, with the pot for the DCS growing in the same way as the SCS and PCS.