Using the word "Ranch" here doesn't mean anything is ranched like cattle are. And yes, those are all classic cadillacs. Gas prices have nothing to do with this location unless you want to travel there by motorized vehicle then it'll probably cost you more. And no, Cadillac doesn't only make 10 cars a year now... Lamborghini is much closer to that Cadillac will ever be.
Here's a More Info link you can add for the Cadillac Ranch:
http://en.wikipedia.org/wiki/Cadillac_Ranch