Have you ever met individuals with insane and brilliant ideas that got you wondering, how come he knows all this and it's not even reflected in his life? Some could give you real business ideas that could change a whole generation but that's all they can do, they can't bring it to reality and all their ideas only end on the discussion ground and never come to life.
I think that the reason that they don't make their ideas a reality for themselves is that they're not aware that it's a good idea, you know they just see that their idea is a good and the common sense solution for a problem or that they don't have the drive or what it takes to materialize that kind of dream, this is circumstantial though as there are some that are poor but got the drive, there's also the opposite which is the people that have the money but don't have the drive, always doubtful that they can do it and always gets discouraged when things don't go their way which happens a lot when you start a business. I can totally see this idea of using other people's ideas to fuel inspiration for your next prospect business or service or whatever it maybe, the only downside to this one is that if that person you've appropriated or stolen that idea from caught on that you've used their idea to make money, they're probably going to find a way to make sure that you pay them back something.