Sites are blocking access to agents even when they have a proper "ticket" for access.
(Shrug) Well, they must not want to sell anything to me.
This is not a battle that site owners want to fight. They may think it is, but they're horrifically wrong about that.
It's insane to me that people don't see that agents are going to be how you interact with your computer going forward, almost exclusively. The people who make things hard for agents are going to get eviscerated by the people who don't just make it easy for agents to do things, but market primarily to agents rather than humans.