I saw a video on YT regarding something similar to this but the speaker (whom I think was a Tor dev) mentioned it having it's negative effects. In the video however the reward was increased bandwidth or something like that for providing the faster connection. However, I think there's no need for a TorCoin they should just use BitCoin instead.
Wrong, no one on their right mind would use BitCoin if they wanted full anonimity (anyone on Tor wants full anonimity). They just should use Monero, which is already working with i2p.