Bottom line is the advertiser gets what the advertiser wants. Low lead conversions are normal on a lot of offers like "win a free cruise" email submits but they still want to see where all the traffic is coming from.
If they see a sky high conversion rate or an odd referrer, they are going to assume something is fishy. brittany46 basically stated the best way to avoid trouble, bring your conversion rate down with other traffic and spread it over multiple CPA accounts.
If your leads are using BS phone numbers or thier data is run through a verification system and nothing matches, your going to get complaints ans the network will cancel your account.