The people outside a church might already have bibles, but they're also a community shown to have an interest in bibles. Even if they already have them, they're

The people outside a church might already have bibles, but they're also a community shown to have an interest in bibles. Even if they already have them, they're still likely to have more interest in getting more than the general population as a whole. On the other hand, trying to sell bibles outside a synagogue is probably not going to get you a lot of success.