I think this is common knowledge. Its always puzzled me why advertisers expect the unbelievably detailed metrics and proof of effectiveness for online ads and

I think this is common knowledge. Its always puzzled me why advertisers expect the unbelievably detailed metrics and proof of effectiveness for online ads and only want to pay pennies. Yet they are happy to toss millions into the void for TV advertisements. I guess since there is no way to know if the ads work its just "we've always done it that way.