we’ve done some skinned sites and “custom” sites via WC Travel
if you get traffic you can make a few bucks. at one point i had a portal that was for landbased casinos around the great lakes. The site was getting 8000-10000 page views a month and it was making $250-$400 from travel booking on a site that ran casino banners.
we’ve done some custom portals off this hub site: http://www.gettophotels.com