I do think sometimes there's danger in guest appearance mania. I've seen too many examples that sound cool on paper like 'Oh get that guy to sing the hook on that guy's song ' and then that's all it is. It's a cool idea that sounds good on paper.
It's cool to have instruments lying around because they give you different ideas.
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It's pretty cool that people will pay for something even though they don't have to. It's totally different now to back in the day. Now you're paying for a record because you believe in the band. In the future that will be the only time people will pay for albums because there's some kind of connection.