Because of legacy hardware. Getting loads of locks re-cored is expensive.
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There's probably thousands of undeveloped patents preventing innovation too. I have a naive idea of how to get around the legacy locks problem without re-coring but I'm sure patents would stop any development.
Not sure why I was downvoted. A 2 minute search yields just these patents:
http://www.freepatentsonline.com/7069755.html
http://www.freepatentsonline.com/5701828.html
http://www.freepatentsonline.com/5974367.html
http://www.freepatentsonline.com/5999095.html
http://www.freepatentsonline.com/6325429.html
http://www.freepatentsonline.com/6867685.html
http://www.freepatentsonline.com/6483424.html
Wow! Patents foster innovation again!
You'll get sued anyway, relevant patent or not. Just give it a shot if you can.
I would happily pay a locksmith to replace locks. But there's no electronic system I've seen that didn't suck.