...DTube can find massive success if they continue to keep working on the small user experience problems and keep on building upon the things they have been successful with.

Absolutely! And I do agree that retention is a very big deal. Even past the payout, there is still value in the posts themselves. It's pretty disappointing when I am looking for a video on how-to or DIY or maybe even a recipe, only to find a post where the video is gone. Those types of posts are timeless. If they continue to improve retention, I believe that will attract more users.