The service would allow you to search for travel experts by destination or interests and schedule calls with experts to help plan your trip. How much do you think one will be willing to pay for this service?
I think it would be very good and based on what I've seen, in great demand by a lot of people. I know of a site already trying to build this model called ThinkPlaces. It all depends on the quality of the experts you have. Many "travel" experts are not really experts at all, just long-term travelers with opinions.