As I have said in preview posts, I believe that we should as users get to try before you buy on Apps from Apple’s App Store, so as a result I do use the cracked method to try out Apps; however I test them for a few days and if I like them and think they work well, then I will purchase them. As a student I don’t have much money to be spending on loads of Apps such as the amount as I do now so I buy what I like and delete what I don’t.
However as I wrote before Beejive IM began to stop pirates using there App, but today I tried the Camera Zoom App from KendiTech and got a trial expired screen:
As you can see the developer has now implemented a system so that it can tell if the App has been pirated.
Now I agree that developers should do this seeing as this App is very cheap to buy from the store and obviously it’s supporting these hard working developers. But it brings an interesting note, developers should allow full versions with trial periods of say a week or a few days so that the user’s can get a taste of the App before spending there money and leaving bad reviews.
Sam's Blog 
Developers (like me) spend a year working on an application, try to make some money (in my case to fund college) and just watch their app get stolen.
I think a lot of people underestimate how much work it takes to write an application. How long do you think it took me to put an option for uploading to Flickr in my yet-to-be-released app? 30 minutes? 45 minutes? An hour? Wrong—it took me 4 days.
This article is what I’m talking about: http://vibealicious.com/blog/development/software-takes-time-and-money-to-develop/