Wanna know how to make money quick? Most people want to be first or number one in life or their profession. They have been convinced thinking first is better. You could target product niches like "first to know" information, how to be a number one (anything), good listening habits.
Many people want to be in love or loved. They also seek to avoid those things harming it. Such as getting a divorce, breaking up, etc. You could target product niches like relationship counseling, dating services, single bars, etc.
Most people want to be attractive to the opposite sex. You could target product niches like flirtatious tips, makeovers, attractive clothing styles, perfumes/colognes, etc.
Many people want to avoid risks in life. They avoid taking risk because they may not be able to afford the consequences. You could target product niches like medical insurance, legal insurance, life insurance, smoke detectors, safety equipment.
People are looking to get married. You could target product niches like wedding supplies, wedding dresses, consulting and other pre-marital services.
Most people want to retain their memories and remembrances. They want to maintain them and have them to pass down to their children. You could target product niches like cameras, camcorders, photo albums, paintings, diaries, journals, etc.