Thread name fail. See, when you post "emd power case study" as the title of the thread, people click through thinking they'll see a ... you know ... emd power case study.
You should have named the thread "might possibly do emd case study if I earn enough money to afford a couple domains, and enough people saying go for it". I would have suggested sticking "on an impossible to rank for keyword" in there but that would make it too long.
There are so many variables when it comes to this and I can't even begin to start counting all the fails I'm seeing so far.
Soon i will open new service so i will get money for this case study and i will open new theard
Ok well just so you know, opening a service is going to cost $97 for a Jr. VIP membership + $20 for a thread. (point being if you can't afford domains you might not be able to afford starting a service).
Now im looking for aged domains.
Wait wait wait. You're going to test out how various domains compare to each other, and you're going to do this by using aged domains. Do I even have to explain why this is failing before you're even starting?
So you get a 3 year old aged EMD .com, a 2 year old aged .net, a 1 year old aged .org, a brand new .info ... blah blah ... stick unique content on them, I'm assuming get backlinks to them. So when they start ranking, how will you know EMD does better than non-EMD or dashed EMD when all your sites are different ages? Maybe they're ranking differently because they're different aged.
And if you don't know that the age should be the same, you probably don't know that the content should roughly be the same, the backlinks should be the same, the link velocity should be the same, (everything should be the same) so when one ranks better then the others, you say "ah-ha! it was because of the EMD".
Does this kind of test need doing? Sure, would love to see it. But if its going to be worth anything, the only differing factor should be EMD, semi-EMD or non-EMD.