Many people claim they pirate apps to do just that and claim Apple doesn't offer app trials. Well, Apple and others feel that's false due to the multitude of "lite" editions on App Store. Apple pushes that belief with adding a new section on App Store to promote free apps. One of the subsections of this new feature is "Try Before You Buy" without pirating.
This section features many of the popular "free" or "lite" editions of apps, but the section title is what makes this all interesting.