I'm thinking you should quickly rename it to Tripfox, TripBounty, or something else. It seems like the real value here is replacing travel agents more comprehensively than something like Kayak does.
Many thanks. You're spot on. And it's so obvious in hindsight, but alas.
We've already had a contest asking for accomm recommendations and it worked surprisingly well. That person paid a $200 finder's fee and it was great to see experts who'd been to the same places recounting their experiences in detail and giving highly practical advice. Of course you can get this for free elsewhere, but the whole package is worth paying for. This person saved a fortune on the flights alone.
Good luck!