That means your wasted ad spend has a lot of opportunity cost associated with it. You need your budget to buy clicks that convert.

If you waste it on something else, you dramatically reduce the effectiveness of your Google Ads account.

Wasted Ad Spend vs. Quality Score

Now, it’s important to note that this model only explains about 59.7% of the variation in the data (R² = 0.597 after log-level regression). However, it is an accurate model of the data (ρ < 0.001).

As a result, the exact rate at which wasted ad spend increases your cost-per-conversion will vary from account to account while still following the trends outlined in this article.