Insane in term of too cheap or too expensive? for me the rate is pretty cheap for a month, although the avatar does not contain a clickable link, it is worth for few people to milk every penny for their posts
It is too cheap in my honest opinion, an avatar can 'bring' more visit ((also if it is clickable) respect than a signature, because an avatar appears more than a sig ad (by the way this is only my personal opinion, and a good rate could be 0.10 btc per month).