For the event I was looking at (a Cubs game @ Wrigley, if it matters) 3 of the 4 links I clicked went to tickets that were no longer available at StubHub. You obviously have no control over third-party content, but the result is that I simply closed the tab your site was in and continued my search directly on StubHub.
So right now that's a result of the frequency of our crawler runs. We're in the process of ramping that up to provide as close to real time results as possible.
Unfortunately, most of our ticket providers are stuck in the dinosaur age so it's difficult to provide close to real time results (like the airline industry).