In addition to what everyone is pointing out, the fact that conversions (i.e. people actually buying stuff based on ads) are trackable now shows a lot of people just how INeffective most advertising is. If you spend time and money targeting your ad campaign and still get a negligible conversion rate, you may well take away the conclusion that advertising won’t work for your product, and look to other means of selling or making money. Traditionally, when tracking conversions was very hard and extremely inexact, you could easily keep up a failing ad campaign for years, supporting the newspaper or whatever even though it wasn’t really working for your business.
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