I used to work for a B2B advertising agency, we did a campaign for the largest teleco in the US targeted at C-level executives to by their enterprise products.

I used to work for a B2B advertising agency, we did a campaign for the largest teleco in the US targeted at C-level executives to by their enterprise products. Our engagement team said (privately) that they had spent 20k per click. And had no idea if any of those targeted VERY expensive clicks resulted in leads let alone sales.