Ask yourself does it really solve at least one of the three: 1) Fix a PAIN point that people will pay money to make the PAIN go away. 2) Make them more money.

Ask yourself does it really solve at least one of the three: 1) Fix a PAIN point that people will pay money to make the PAIN go away. 2) Make them more money. 3) Entertain them enough that they'll be willing to pay.