First off, I think AirBnB already falls under "travel". This is just a rideshare idea. Craigslist has this already–if their rideshare section was as big as, say

First off, I think AirBnB already falls under "travel". This is just a rideshare idea. Craigslist has this already–if their rideshare section was as big as, say, their dating section then I'd say "great idea. make a site for it." ... but it isn't. For most people, I'm guessing the free gas does not outweigh the inconvenience of coordinating the pickup and/or going even slightly out of one's way. Great business ideas save people time and/or money. This is saving people a little money at the expense of their time.