Why is it important rating the discussion ?

yes , your assumption is correct . Rating the discussions and posts directly or indirectly modifies our earnings . Mylot uses a complex formula to calculate our earnings and the rating we receive for our posts could be a part of the formula . More number of +s could mean more earnings and more number of -s and !s could mean decrease in earnings . pls see more details about discussion rating here : http://www.mylot.com/o/faq.aspx#DRS