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A way not to bring in income:
-sell user data.
First, likely nobody wants your data. Second, your user data is worth more to you than to anyone else. Third, depending on what you collect and what you do with it, you could be in violation of various laws.
If you don't have zillions of hits or a few hits by an exclusive set of billionaire visitors, why would any pay you to see your user data? Especially when I can get so much user data for free?