I can tell you that no one does what they do to the scale they do it in.
I pay them 2k a year to advertise in the US and Europe. I have a rental condo on sanibel Island in Fl.
My yearly average was about 18k a year prior to coming on board in 2008. Since then I'm doing averaging 38k a year. The complex contains 42 units and 40 are rental. Everyone one of them subscribes to Homeaway.
800,000 units in the vacation portfolio. With millions of users going thru the Homeaway websites. That's why Expedia is getting involved, they know the value of Homeaway.