My fun little side project. I needed a place to sell my Bruins season tickets without StubHub gorging me on commission, or gorging my buyers on "convenience fees".
Try and put the sign up form after the user has described a ticket. If possible, avoid setting up a password and just ask for an email. Once someone puts in even a few seconds entering info, they have a vested interest to not quit the process.
These little things take extra time to get right, but help conversion.
I'm not a big sports fan (and not in the US), otherwise I'd have more useful feedback.
One more thing: Your featured listings page looks more convincing than the homepage. I'd put at least a few listings, the phone number and testimonial on the homepage.
So, I learned Rails and scratched my own itch.
Would love to hear what you think.