This is not a bad idea in general but there are many cons as well. For example new ANNs often are posted by newbies.
The Copper member is what can solve the gap here. Now it's only used for newbies to post images and I think remove some restrictions in sending PMs. It can be used to give you access to write in a threads and sections restricted for newbies for example.
With the income from all those copper members, more Mods can be hired and there will be more control.