Seeding too many will distribute your upload too far across too many torrents you will be a waste of an uploader.
I don't see how that's a problem to the seeder, since it's global ratio that matters, not individual torrent ratios. I find it more beneficial to be running ~100 at once, because of the greater chance of snagging leechers. But in any case, that's kinda irrelevant to OP's problem.
Anyway, at OP, that's a rather odd problem. I don't live in an area that Comcast services. You might want to check with your ISP to see if there were any recent torrent throttling measures put in that somehow limit upload but not download (not likely, since you say it only affects BBT torrents). Also try resetting your network (shut off everything and power back on).
If worse comes to worst, there are, of course, many other sources of anime than BBT, as you should know already. I personally usually use BBT as a last resort, for the times when I can't find what I'm looking for anywhere else. If you find through your close monitoring that your upload is really next to nothing, your best course of action would be to finish what you have already started downloading from BBT and don't add any new ones.
You also have the option of downloading off the public BBT tracker, if your ego/dignity will let you. Search the forums if you want to try it, or just read billanam's post.
Seedboxes are another option. Use Google. You also need a decent amount of cash, and the ability to pay online.
Back to the problem. You're sure you aren't getting any tracker error messages? And you didn't recently install some new torrent related thing, like PeerGuardian, right? And yes, 1MB in 2 weeks is very bad. Even seeding a 150/1 torrent you can expect to upload at least 100KB in 24 hours on dial-up speeds.
And about your question about getting booted for poor ratio, you won't. You will be warned when your ratio hits the threshold, which is not known but I think is around 0.100. At this point, every torrent that you are not specifically seeding (i.e. torrents you are still downloading) will halt, while torrents you are seeding will continue seeding. You won't be booted from the site. In fact, you will still retain all of your account abilities, with the exception of being a Power User (you might be demoted back to User when your ratio falls below 0.500), meaning you won't be able to offer anymore.