How about a one stop shop for Amiga software? It might encourage people to write software if they can sell it for a few bucks.
I don't consider there to be enough Amiga stores to exist to not feel like I have an app store. I just have to wait for shipping.
Most of what there is to get anymore is from os4depot anyway.
If you want to pay for it, pay at amigabounty.net and then hope it shows up on os4depot someday.