Everytime I start a discussion my points don't add up but you'll see increase in your earnings within 24 hours just observe it. It might not increase your post points but it will add up in your earnings.
I think you wouldn't get any credits for the discussions you start but you will get your earning through those response to your posts.Anyway I didn't notice any of my posts did earn me money or credits so far:(
I have started to some and got points in the beiginning but after that I have not earned anything with reppsones or starting a disscusion or comments from other people as a matter of fact I have been deducted from...
I've found that if you go in after a while and add a comment, the discussion goes back to the top of recent discussions and people see it, that usually revives a lot of my topics. Just try it, you'll see.
You get one credit for your discussion after someone has responded....you don't get credit for all the other responses to that questions.. But if you have a good question ask it. We need more good topics on here.