CrackBerry's Sour Grape
the first item I would research would be, how are customers finding your product?
If you find an abundance of users are finding your app from search engines or directly from your website, then the co marketing you are doing will directly affect the user impact.
If most people are just going and getting it directly from App World and not being redirected by your site, then you should still have it anyway.
You want the customer to know that you are in App World and to get it from there, as you dont just want to start passing out OTA links or asking for donations.
Either way, the more you get it out there, the more exposure you and app world will get.
just my opinion.