[pooriaazimi]

You can sign ipa files with your developer (private) key. There's an app called InstaSign that I use for "testing" apps before purchasing them. You download a cracked version, sign it with your own key (so iPad thinks YOU have created this app, like when you do in Xcode) and see if it's worthwhile.

It's saved me a lot of money that otherwise would've wasted on scammy, buggy, "not-working-as-advertised" apps. If you're a developer (i.e., can sign apps and load them unto your device), give InstaSign a try.

They're probably using a similar method (as they seemingly test on iPad/iPhone, retina/non-retina, iOS5/6 devices and it might be a bit more work for you to add at least 6 new UDIDs).

[akaru]

I was wondering how you did that. How do we know you're not simply cracking these apps to resell? It sounds a bit fishy is all.

[pooriaazimi]

Just to be clear, I'm not with testelf!

Just wanted to point that out in case you get the wrong impression of them not replying to your (fair) accusation :)