This is actually a good idea. If you find a niche where there is a market but the the existing apps are of low quality you may be a winner. I have seen on PH a

This is actually a good idea. If you find a niche where there is a market but the the existing apps are of low quality you may be a winner. I have seen on PH a list of products which have high number of users but low rating (I believe it is because of low quality of the app)