Sorry for my bad english....
Are missing some important things:_ the link (and the avatar) of the content owner (appear only the username/name);
_ the post of new contents in newsfeed (now the plugin is not integrated with newsfeed);
_ the change to choose to view "all categories"; if you click to one category, where is the botton to come back to "view all"?
_ the change to choose more tipe of files and size limit of the file (i changed this from php);
_ the change to click "view all product of this user";
_ the change to choose paypal mail or the paypal member ID (for privacy reasons!);
_ the admin must have the possibility to see the contents that are published.
_ Add a free preview of the video visible in streaming, if the file on sale is a video (like manyvids.com).
Can you add these features in short time? I can pay other 50$... Happy new year! :)