When you have an excess of bonus points, here's a fun trick to boost ratio.
Find a torrent that you desire (say from wishlist), that is barely alive / has few seeders.
Spend some bonus points to make it Freeleech for all.
A second later, start your own download.
Result: You get a desired torrent for free (zero download credit).... and you are "early" in that particular freeleech (good chances of upload credit).
The Exchange page would give you 1 G of upload credit for 100 bonus points. But, with this technique, I can often get several G - plus a free download that I'd been wanting. A better deal.
You do need a proper upload setup in terms of ISP, port forwarding, leaving your client to run overnight, etc.