No.

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Too short? OK: if you charge for your visitor’s guide, charge for your app.

If you do charge for your app, do realize that sales for “paid” apps are only a fraction of free apps. Since every visitor using your app is more likely to spend money in your destination (and in particular more money on your members), that’s where the money is to be made.

If revenue generation is required to pay for the app, consider premium placements within the app, banner ads, and charging for access to features such as Twitter.