So do I. In fact all of the 2010 maps and the 2011 maps up until 2011.30 I unlocked using a patched MapSource and with an .unl file. I cannot tell whether that trend continues because I don't use a patched MapSource file, but I do know that with the current version of MapSource installed, this is what I get when I look at the "Unlock Regions" tab:

Spoiler: image
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That there is a .gma file, which is (best guess) a hash file based upon the map's unlock code and the GPS receiver's serial number. The hash is created when the map is downloaded from Garmin, and converted to a file when transferred to a GPS receiver. With this file, the maps will only work on the device in which they were intended, and only in the configuration specified (e.g. lower 49 states, North America). Without this file, the maps will not work at all. This is the problem I had encountered when I downloaded 2012.10 from Garmin, and it took Fast IMG Unlocker to fully unlock the maps so they could be transferred to my other devices from my 1300LM.