I am not a leech. I leave files up for seeding after I have completed my download, but if I see 10000+ seeds available for a particular torrent, do I really "need" to leave the file up for seeeding?
No unless it's for ratio purpose's or a private site will label you a hit and runner but you should and should upload as much as you download. That's the basis of Bittorrent.
Fair is kind of an ambiguous term. I would say a 1-1 ratio if possible, private site's demand less but can give fewer privilege's and I'm not sure if any public site care's. I guess fair is up to the person but for you to download the entire file, somebody had to upload that much to you, seem's fair to me to upload it all too.
ISP's all seem to give an upload rate far lower than the download rate, some even throttle on the upload side although I don't quite see the point of that. My upload isn't throttled but I'll still be uploading (at max) a file hour's after I've downloaded it. That's where Newsgroup's excel to me, no uploading.
I know the upload rate is up to the ISP but the blocked site's are due to PG and the slowness on some could be due to PG, bandwidth usage, distance, don't know but it's not on all, most are fine.
The user has little control for any given job. However, you can control how many jobs you have. I throttle both up and down. My down is always pinned to max while my up is all over the place. Even though my down is 50% bigger than my up my ration is just the reverse.
3:1 is a fat ratio I was about to lecture you because I thought you were 1:3. By all means drop the fat jobs as long as you are good with that tracker. I think anything better than 1:1 marks you as "safe". Trackers steer all goodies to the most complete safe haven when the torent is down to 1 or 2 seeds. The additional ration is offsetting the cut and runs. I also give charity for rare weak jobs that might not survive without someone proping them up.