As many defunct companies discovered during the millennium dot-bomb crash, eyeballs do not equal revenue, even those attracted via expensive advertising. Pets.com, for example, and even Yahoo most recently. Without knowing your business model, it is impossible to answer your question on a forum like this. You need to consider many things, such as competition (bricks and mortar are doing this already in many markets via their own apps - order and pick up later), perceived value, geographic reach, testing results, and where your non-Facebook buyers have come from. Feel free to contact me directly to discuss.