Sorry for posting three times, but I'd like to address the whole beef with AExtras. AExtras is a source provided by the company to obtain AC's for free. It has become standard process for different MMOs to do something similar, and different companies such as Matomy and Super Rewards rose up to fill in this need. What happens is that we'll complete the individual offers that are supplied to us by these companies, they'll receive cash from the affiliates that validate our completion, then they'll send a portion of that cash to AE (Who gives us their virtual currency in return). If you don't receive the reward, it is due to a problem between the companies and their affiliates. When AE receives their cash, we receive our rewards immediately. Look at other gaming firms that use a similar process (such as Nexon), and you'll see that they team up with the exact same companies, those companies provide the exact same offers, and, once complete, you run the exact same chance of getting your reward.
And at the above poster, if you want to use the download offers I highly suggest getting Sandboxie. It downloads programs into a quarantined area of your computer in which the programs cant operate how they want to. Also, it provides an option to delete everything that you downloaded using the program with a single click.