pretty sure YouTube ads are directly trackable though -- if someone clicks it and funnels through to a checkout process and pays, they have a direct report of how much they spent on the ad versus how much they made directly from that ad.
YouTube in-video sponsorships are a different beast admittedly; however there is still some basic tracking through use of promo codes (Use code JOHN15 for 15% off). They can see a report of how much they spent on ads that mention JOHN15 and how many sales included that promo code -- if sales vs ad spend are significantly positive, it becomes simple math to determine how much more to spend on ads, or to discontinue them.
I suppose your point though was that it's not possible to track the negative sentiment generated by the ads (people who get annoyed and decide to avoid your company at all costs). That is true, but companies who rather go down the path of something trackable than an unknown shot in the dark.
You're spot on with "go down the path of something trackable". The next step is they assume everything they tracked represents all data for all possible outcomes. It can't.
YouTube in-video sponsorships are a different beast admittedly; however there is still some basic tracking through use of promo codes (Use code JOHN15 for 15% off). They can see a report of how much they spent on ads that mention JOHN15 and how many sales included that promo code -- if sales vs ad spend are significantly positive, it becomes simple math to determine how much more to spend on ads, or to discontinue them.
I suppose your point though was that it's not possible to track the negative sentiment generated by the ads (people who get annoyed and decide to avoid your company at all costs). That is true, but companies who rather go down the path of something trackable than an unknown shot in the dark.