Online video ads command sky-high rates — a $30 CPM, or cost per thousand viewers, is typical. Yet more than half of all Web users will stop watching an online video as soon as they see an in-stream advertisement, BurstMedia reports. A full 78.4 percent say in-stream advertisements in online video are "intrusive." And it's not really worth it to you if they do stick around, anyway. Only 21.4 percent of respondents say they remember video ads any better than other advertising forms. That old adage about half of advertising being wasted — we just don't know which half — still rings true.

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