[obviouslygreen]

I'm yet to have any idea that passes the "would I pay money for that?" test.

My apologies to the long-deceased quadruped I'm about to assault, but assuming you mean "I" as in yourself, the person writing, "would I pay money for that?" is only a useful question if you are confident that your target demographic's needs, goals, priorities, problems, and disposable income are extremely similar to your own.

Market research is hard, in no small part because people will unwittingly provide you false information all day long on what's worth solving and what they'd actually buy. Those are separate problems, though; starting off asking who your product should appeal to will then let you start investigating the right question, "will its intended target audience pay money for this?"