#2. Great promotion for the network
WWE is always trying to find new ways to promote The WWE Network to their viewers and believe it or not, events like The Great American Bash could be a turning point in that battle. It could even be the start of WWE offering up more appetizer-like special events to get fans hyped up to buy the network.
Think about it! What did watching The Great American bash make you want to do more than anything else? It made everyone want to discuss and watch more pro wrestling, which is all available on The WWE Network. In fact, it's free and really helps get newer fans invested in the overall product.
In the end, these are the kind of events that make you want to buy a network subscription and WWE needs to capitalize on that. How they ultimately do that is up to them and will depend on how they choose to make these events appealing, but the pieces are definitely there for some cross-promotion.