Wondering if anyone has tried or considered this idea.

Several Main categories (Houston, Denver, Atlanta) This classifieds system only handles a few specific markets.

There would be about a dozen sub-categories under each main category.

We only allow a few users in each Main category to create listings. (Yes, this would require restricting users to only listing in one main category)

I understand this derails the geographical features of Geo.

Thanks for any input.