Regarding #3 I think they want the patent holder to prove he is actually using the invention for a (commercial) benefit. If you invent a copy protection scheme they want to see you actively sell it to third parties or actively use it in your own product. I think that makes sense to be honest, people shouldn't be able to sleep on an invention until they find a suitable company to sue for high profit margins.

Edit: This is in reply to points about software patents only.