^30GB @ 6mbps
or unlimited @ 200kbps
choose for yourself
You'd download more on that 200kbps

I'm still unhappy with my 1mbps upload, but luckily there's no limits. My PC is on 24/7 and since I have bandwitch management on my router, I just lowered priority on uTorrent port and it can even go full speed when I browse sites no problem. My overall uTorrent stats are 411GB dl, 1,48 TB ul, but BBT torrents' ratio would be lower because even when all other are stopped, it just won't upload because of other seeds

(site says 3.9, but it's because of freeleech and some torrents downloaded before creating an account).
As to question why, it's because if you're not a moron you know, that for you to download somebody else has to upload it. I just can't stand my friends throttling upload to 1 KB's on Polish public torrents, most of them go like 50KB's at their best because of that behavior.