Up until recently, FirstDIBZ has concentrated on the sports sector, giving people a way to unload their season tickets or generate buzz about ticket pre-sales for teams. I'd seen the company logo around the Web on sites like the New Orleans Hornets, for example, and thought it was a neat idea. I didn't really get interested until the recent announcement of other ways to use the service.
If you are a company like Mashable that frequently hosts networking events, you work with a finite budget. This means you need to ensure that each event gives attendees the most bang for their buck. This includes choosing the right date and the right location. If you hold your event in the wrong place, you might miss the chance to offer networking opportunities to the most people possible.
The other nice thing about FirstDibz is that it would also allow you to acknowledge people who voted for the cities not chosen by giving them a discount on the event city closest to them, or on a future event in their city. There are a few things that might make some customers shy away from FirstDIBZ, not the least of which is the concept of placing a monetary value on anticipation.