How Many Ad Networks?

[Thunt]

Is there some disadvantage to having lots of ad networks running on my site? I've got three right now...

ADSDAQ>Tribal Fusion>Burst

Should I just put in a whole bunch more or is it smarter to keep it to three networks?

Thanks for helping out this rookie. :)

[Chris]

it never hurts to add more downstream, try Valueclick or Casale after Burst