Are earnings affected by the number of responses one gets from his posts?

No , you will not earn anything if you comment on your on discussion. you only earn when you respond to other's people discussion and it can be a response or comment . It is good reply to your own discussion because it is good way to increase your reputation on mylot and your star rating as well. You will have star rating when you reach 100 post. There are other ways to earn in mylot too. You can try uploading images to discussion and get referral. You will earn 25% of from the people that you refer. read more at http://www.mylot.com/o/affiliate.aspx

Yes it does. The more responses you get from your topic the higher earnings you get.That's my own experience before the changes starts in Mylot.Now I'm not so sure if we still get some earnings from responses to our topics.

Yes, I think so. I heard some people around here saying that you starting get paid by responses to discussions you start once it has 10 responses.

I think that if you are going to give comments to the replies on your discussion you are going to earn something but if you wont give comments you wont earn nothing.Atleast thats what i've observe on my discussions.