See sig for my 3 Affiliate Programs.
I think if you are building a free site, or a TGP, or a Blog, something like that, then sure you can load up your page with as many Sponsers as you want. We would just object if you were to use OUR images/videos to promote a different Sponser (like links going from OUR pictures to THEIR Tours kind of thing).
Hit me up if you have any questions, and best of luck!