* Note: Chann3lz was purposefully trashing videos from the wrong stack, the youtube trash pile, so I fixed that, it will trash videos from both stacks, just to be fair so the youtube trash pile goes down.. Read the rest of this description to see what I mean.
There is a threshold limit of 30% of the total number of videos. Total Number of videos is (trashed videos + playable videos). When the number of trashed videos reachies above this threshold, in this case 2735 videos (.3 * (2736 + 380 + 6003)) ~= 2735 , you can no longer trash videos, you can only add videos (via "Advanced Search" link at the top of the screen, or by going to another channel and adding videos from there). To insure that the trashed limit is not met again, make sure you add videos you know won't get trashed by someone else (such as pop music).
If you added videos before, and they got trashed, they can't be added back unless you add new content, and the chances of relinquishing the videos that got trashed is 1 out of 2736.. So, not a chance unless more videos get added.
This is because I use use the trashed videos to determine what content (or youtube video codes) can't be added back. Also videos that are already in the database even if they are not trashed, they can't be added twice, this is to maintain that there are no repeats (repeated youtube video codes) in the pool of videos. So try adding 10 videos, then you can trash maybe a few more videos.. But so can someone else..
BTW, if so many videos are added that only 0 videos are trashed, which can happen, any videos added will increase the total number of videos, and will also increase the number of videos that can be trashed. For instance if 12000 videos are in the database, 3600 videos can be trashed.
So In general, just keep adding videos.. and avoid trashing videos until there is enough untrashed so you can trash again.