I never have any that are even half-decent. Plenty for things that aren't businesses. Sometimes I act on those but they don't make me money. None for businesses. When I think I have one it always turns out there are a few players in the space already, one or more of them appear to be doing a good job with no clear way to outdo them, but nonetheless all appear to be struggling (so it might have been an OK idea when no-one was doing it but trying now would pretty much be doomed, spending weeks to months to get off the ground to take 10th place eating from a small pie). Or it's something you'd have to have FAANG resources and/or a huge pile of cash available to do (owning/collecting relevant machine learning datasets, mostly).
When other people say "hey I'd love an app that let me do X, you should build it, you'd make so much money" it usually turns out there are already 20 in the app store, and they "love" the idea so much that they'd never bothered to look for one. This is true whether it's for themselves, or for their job.
What is rare is the hard work needed to make an idea a reality.