clickbank vs real advertisments?

ok bhw, thanks for stopping by. what would u guys think to do. lets say hypothetically I got 300,000 visitors a day to my site. would you guys rather put a couple clickbank ebooks on their or invest in some real advertisers such as GoPro, Pandora, Facebook, or whoever wants to advertise on my site??

realistically If I had 300,000 I know I can maybe turn it into a million and so on
what u think?