How many app markets do we need?

The title says it all really. With the Amazon app market coming up soon, do we really need another app market?

I know that some of these markets offer an alternative market for tablets that do not have market access, such as Archos using Appslib and there are some markets which let people install apps over the air, such as appbrain.

The latest alternative market from Amazon seems to just be another market. There are many questions though. Will apps through Amazon will be cheaper? Will Amazon give developers a better deal than Google? Will Amazon be easier to use? Will there be more control over copyright issues? The answers will soon be revealled.

I think the Amazon app market will probably be a better option for device manufacturers who are not allowed access to the official Android market. It will also be easier for people to use as most people have an Amazon account. But it ends there. I can’t see any further use for it.

So let us know, will you be using the Amazon app market? Can you see a further use for Amazon? Do you use any of the current alternatives? Should Google have took an approach similar to the Apple app store?