Honestly thinking, It is their choice. Example, If I buy a Bentley, you cannot force me to show-off and ride around the town, maybe I like it in only my garage.
Correct me if I am wrong, but there is no rule against Ratio Hoarding anywhere.
I do ratio hoard to some limit, because there are some old shows I have to download, which I know later I will not be able to seed (no one will download from me even after a long time). so I have to keep a buffer.
When someone "Races" on freeleech torrents, obviously he/she is seeding in the Process, so maybe the other user seeds for longer.