You might be interested learning about how your apps and games are protected. As a Windows Phone developer you can be assured that Windows Phone Marketplace is operating as designed in providing a level of protection that's in-line with industry practices and sufficient for our own valued content.
You can learn about our protection model in the WPM Anti-Piracy Model white paper (embedded below), which outlines our perspective on leak prevention and leak containment.
"It's important to note that because of the leak containment steps Microsoft takes that apps obtained outside of Marketplace willn't run on consumer retail devices. Modified files would only run on a limited number of "unlocked" phones, such as those that've been registered by Marketplace developers on App Hub. It's also worth noting that in extreme cases, WP Marketplace is capable of un-publishing any app, disabling individual apps already installed, or disabling a developer's account and their use of a developer unlocked phone."
b>Reference: White Paper]