Because of the legalities of assisted openers, they have no choice. You cant buy brake mastercylinder rebuild kits in parts stores anymore either because they cant trust people to do it correctly themselves. No offense to you but you know the old "one bad apple" story. This has been discussed before and one forumer did actually get it back together but needed a 2nd set of hands to do it(he had all the parts) Normally they end up recieving it all back in a bag with a request to put it back together. It is in the public interest that they take a harder line on this. If you read this forum enough you will see that they have done many repairs free of charge without being asked to do so in the interest of service to thier customers. Not to mention, their 4-ever warranty which isnt unconditional but by the way they administer it, you would get the impression it is. Buck is doing what it know to be right to protect everyone.
Remember also the Sawby lock issues of the original Bucklocks-if someone gets thier fingers cut up because of a lock failure, it is just not worth the risk.