i think user interview or a showcase would be a great way to boost traffic. for example you do sooo many videos with a 1 second blurry swipe of hallet daves boat... but then theres hardly any pictures of it on the site. theres some boat making a balls out pass down the river that sounds amazing, but for us that arent in the circle we have no clue whos it is, what he's running, etc.
also ive personally been avoiding threads with busted image links/previews. its gotta be killing your page views and analytics. i know you cant force them to update their app on their phone/tablet but you can restrict them from uploading a new picture... ie: on upload, is your version 2.x?, no, well image upload failed, redirect them to the "UPDATE YOUR APP!" page. done deal.