All these ideas are wrong, because they are cash grabs. Money will never satisfy you. Find a startup you love by looking back to your best memories(10 years ago or more) of creating something and seek to give people that experience. Then, even if you fail financially, you'll still have more great memories, 10 years from now.
I fail to see how industry problems ripe for technical solutions equate to cash grabs. Problems are essentially the basis of every startup (if we generalize a little), and I can assure you that engineers can be passionate about solving a problem.
I also don't really understand what you mean by giving people the experience of something you were creating in the past. What does that mean? As advice it seems exceptionally vague; something an writing teacher might tell me to write about, but not solid advice for founding a startup.
Downvoted because your comment is only tenuously connected to the subject: which problems in your industry could be solved by a startup? We're talking about problems that need solutions, not the worthwhileness of the financial rewards from problem-solving, an abstraction and question that is wholly irrelevant to the topic at hand.
