Myspace Adviews Drop to 0 in a Few Hours

[newbie2008]

I've started several ad campaigns in Myspace and they all initially start with anywhere between 2 to 5,000 ad views then suddenly drop to zero within a few hours. Can anyone tell me what I'm doing wrong?

It's not the ending date. I was thinking maybe it has something to do with the cpc?

Thanks.

 

[edward_b]

Click thru rate - if the ads are not getting clicks, myspace will stop giving them impressions. ctr is king!