Goodtar on Pandora but not literally

I've noticed a couple things about Pandora recently. First, it really things that I like Brian Jonestown Massacre. How many times will I tell Pandora I don't before it believes me? The other thing is that after a while every station I create just starts to play songs I already have on my itunes. I think the only one that is safe from that is my Louvin Brothers station that only plays country music from before 1960. I guess it's really got me figured out, but it was a lot more fun back when it used to play me music I hadn't heard before. After a while it seems more like a game than a music site.