As others have said . . . too low. It's not even going to be worth accepting the subscriptions at that price. If it involves any amount of effort to setup/main

As others have said . . . too low. It's not even going to be worth accepting the subscriptions at that price. If it involves any amount of effort to setup/maintain/pay for hosting etc. look for an idea that is in the $29/mo+ range. It's more about the value than just the lowest price. If it's too low you won't make money unless it happens to be really hands off.