Ok this may or may not sound skeezy to some of yall. Heres what I do. I buy an app, I imediately Titanium Backup the App. Return it, try it out for an hour. If I like it, I go buy it again. If I dont I uninstall it then delete the Titanium Backup of it. Some apps this is not practical with.
Such as Modern Combat 3, because of the big download you have to do for it. Also some other apps that constantly check to see if you own rights to it. (although you can stick it in airplane mode and they work) So for me I use it as a try before you buy. However if you were dishonest you could be a jerk and not pay for the majority of apps.
One thing to think about if your a theif and are going to try this.... you can never get updates for the app!!
So be honest ppl