I came across this LinkedIn post from Sarah Stemen today. The post clearly illustrates why we can’t simply trust Google to deliver the best results for our clients:
“My client had a record-breaking Black Friday. They were popping champagne.
I was looking at the search terms crying a little inside…
My client was ecstatic. Sales were up, ROAS was high, and they were ready to declare victory on Q4. They looked at the bottom line and said, “We crushed it.”
But I looked inside the “Black Box” of Performance Max…
Even though we had requested Brand Exclusions, PMax is a creature of least resistance. It found a way to sneak Brand traffic back in. It was claiming credit for sales from people who were already searching for the company name.
On top of that, I found about 5% of their Non-Brand budget burning on completely irrelevant terms.
𝐓𝐡𝐞 𝐂𝐥𝐢𝐞𝐧𝐭’𝐬 𝐑𝐞𝐚𝐜𝐭𝐢𝐨𝐧: “𝘚𝘢𝘳𝘢𝘩, 𝘸𝘩𝘰 𝘤𝘢𝘳𝘦𝘴? 𝘛𝘩𝘦 𝘯𝘶𝘮𝘣𝘦𝘳𝘴 𝘭𝘰𝘰𝘬 𝘨𝘳𝘦𝘢𝘵. 𝘓𝘦𝘵’𝘴 𝘫𝘶𝘴𝘵 𝘤𝘦𝘭𝘦𝘣𝘳𝘢𝘵𝘦.”
𝐌𝐲 𝐫𝐞𝐬𝐩𝐨𝐧𝐬𝐞… It matters because 𝐲𝐨𝐮 𝐜𝐚𝐧’𝐭 𝐬𝐜𝐚𝐥𝐞 𝐚 𝐥𝐢𝐞.If you think PMax is driving new customers at a 10x ROAS, you will pour more money into it next month. But once PMax runs out of “Brand” traffic to harvest, that performance will fall off a cliff. We weren’t seeing “Growth.” We were seeing “Efficiency” on traffic we already owned…
𝐓𝐡𝐞 𝐋𝐞𝐬𝐬𝐨𝐧: Google 𝘸𝘢𝘯𝘵𝘴 you to look at the blended ROAS and feel happy. But if you don’t audit your PMax Insights tab, you don’t know if you are acquiring customers or just taxing your own brand.
𝐁𝐞 𝐭𝐡𝐞 𝐩𝐚𝐫𝐭𝐲 𝐩𝐨𝐨𝐩𝐞𝐫. Check your search term insights today. If PMax is taking credit for your brand name, your “growth” might be an illusion.
𝐏.𝐒. 𝐖𝐨𝐫𝐫𝐢𝐞𝐝 𝐲𝐨𝐮𝐫 𝐏𝐌𝐚𝐱 𝐜𝐚𝐦𝐩𝐚𝐢𝐠𝐧𝐬 𝐚𝐫𝐞 𝐭𝐚𝐤𝐢𝐧𝐠 𝐜𝐫𝐞𝐝𝐢𝐭 𝐟𝐨𝐫 𝐰𝐨𝐫𝐤 𝐭𝐡𝐞𝐲 𝐝𝐢𝐝𝐧’𝐭 𝐝𝐨? I check for PMax Cannibalization in every 𝐃𝐞𝐞𝐩 𝐃𝐢𝐯𝐞 𝐕𝐢𝐝𝐞𝐨 𝐀𝐮𝐝𝐢𝐭. Let’s see what’s actually driving your sales.“
Source: https://www.linkedin.com/posts/sarahstemen_image-share-7402455177099894784-WJ5M
“You can’t scale a lie” — love this!
PMax sneaking brand traffic back in: that is exactly why I recommend to always use a negative keyword list for your BRAND keywords (including popular typos), and to attach that list to all your non-brand campaigns. Especially PMax campaigns!
– Nils







