I really really want to know how much the featured apps made since they started , since last month , since whatever whatever , I want to be able to check their earnings. Can we do it?
By "their earnings", do you mean how much the app has earned for the house (bankroll investors) or do you mean how much commission the app owner has earned? The former number can be found on the app page as gordonhill pointed out, but I don't think the second number is publicly available.