The system works fine as it is.
On the whole, Reward systems do little more than encourage people to upload crap. This is a problem, even under the current system, where people upload free stuff, old stuff and/or dupes just to get enough ratio to leech. Ironically, the OP has done all 3 on several occasions and this is not his first suggestion thread on trying to gain more ratio from uploading.
By uploading, either an original torrent or reseeding an existent torrent, you increase your ratio and are then able to leech.
If anything, the system should include a method of punishing those who upload crap/dupes. e,g. have their torrent removed, along with any upload credits they gained, AND remove from their stats a sizable % of the torrent size.
So, for example, if you upload 10GB of crap, you get 20GB removed from your stats to start with, along with as much data as you actually uploaded.
Might also be an idea to punish anyone who tried to download it.
I think that could be quite entertaining
I do like the Thanks button idea, or a Good/Bad voting system, but as we see on the forum, even though posting "Thanks" is against the rules you still get a batch of idiots who mess up the thread/torrent by doing so, making it harder to spot the one post in the middle that says "this does not work"