I remember going through this ordeal (of taking a decision) a couple of weeks back with Collision Conference. They'd shortlisted us for the conference at Las Vegas and wanted us to pay a sum to attend it.
Here's what I'd tweeted then, at the time:
https://twitter.com/marvindanig/status/579039796238139392
After reading this post I feel happy that we decided not to attend the event. Apparently, it saved us some embarrassment and precious dollars!