That’s going to put a whole extra load on Asobo Resources. !!
Here is an Idea (obviously I am not a developer for X-Box, or I would not say this)
Since developers of X-Box addons are going to make Money on the Market, should they not be CHARGED by Asobo/MS for the “testing and Certification” of their product for X-Box !! 
Those making FREE products might need to be dealt with differently – since neither they or MS are going to be making any profit from those products on the store.
Remember, at the end of the day, it really all boils down to $$$$ & Profits – lets not keep kidding ourselves that is anything else.