DIY/Makers and anyone else who ends up repairing fancy devices (phones, after market stereo head units, various lab equipment) have constantly fought with this type of thing. It comes in forms of bios that self destruct, glue that's only purpose is to break something internal if a panel is removed, or tamper proof screws on replacement parts.
See the Makers "Bill of Rights" - http://cdn.makezine.com/make/MAKERS_RIGHTS.pdf (pdf). I tend to judge companies on whether or not their products are outright MADE to prevent me from being able to fix it myself. If I can't, I won't buy products from them again. As @meunierc said, "vote with your dollars."