Then something hit me when reaching out to another seller I want to try. They mentioned they could understand why I got a lower signup rate on the product/BizOp landing page because they no idea it was about a making money opportunity until they scrolled down a little bit. Well the subject line/email ad copy clearly states it's a biz opportunity related to the product. That's why I have the ad copy to pre-qualify people before they "click".
So here's my question for those with accurate knowledge. Do solo ad sellers use your subject lines & ad copy you provide them? If some do, then what %? Often I see sellers just asking for your landing page URL only.