Oh, there's clearly a way to productize a particularly obnoxious (and increasingly common) behavior among ethically-challenged ticket buyers, telling them what (high-quality) seats are unlikely to be occupied at a given event.
Say, for example, there is a set of front-row seats for an NBA playoff game currently unsold. The seller may have them listed on Stubhub, or NBAtickets.com (AKA TicketExchange/Ticketsnow), or on Ticket Network, or any combination of those or other resale sites.
With all Stubhub instant-fulfillment listings and TicketExchange listings, the details of the seats are listed right down to the seat numbers.
So, an aggregating mobile app could scan the primary sites to harvest unsold listing details as the event approaches (or, in the case of Stubhub, most events for which they don't control ticketing stay up for up to an hour after the start time) and tell the user that those seats are unsold (and therefore unlikely to be legitimately occupied).
Sadly, this is going on right now - there are third party sites which are scanning prime unsold seats and taking existing valid cheap-seat tickets and editing the section and row details to match the unsold listing,then selling those cheap seats as the better seats. I have experienced this firsthand with my own Sharks club seats.
This fraud problem (and other extensions of this tactic that the reader can easily guess) is exploding and will continue to do so as long as idiot venues stick with PDF (or other user-editable) ticketing and lax seat piracy enforcement.