No, if I go to a festival I buy a ticket. I go to those festivals where I think I'll get my money's worth and have an enjoyable experience - which for me includes playing as well as listening to music. Who's on the guest list is not a major deciding factor in choosing those festivals, although the nature of the guests booked may give clues to the nature of the festival and whether I'll enjoy it.

That's not to say that I don't consider important that a festival has a good guest list, just that I don't base my decisions on which individual performers will be appearing. I decide based on other factors, then if someone I'd like to see is on the guest list I'll try to get along to their performance.