You don't feel user experience and earnings are related?

True. Better user experience could increase page views and in turn earnings. I was just wondering if RPM may be increased on its own aside from just a better user experience. I can apparently reduce my ad balancer to around 60% and still see the same earnings. Would doing this possibly decrease my RPM? I’ve never used ad balancer and that’s why I’m asking.

The Ad-Balancer will reduce the number of impressions by blocking the ads that are least likely to be clicked or provide little or no CPM revenue. Thus the total number of impressions will drop and earnings will remain stable RPM = Earnings / impressions * 1000. Math => reduce the value of the denominator and the result increases. Higher RPM because math. But don't be fooled this is only an artifact of the RPM metric. Your total earnings should not change (assuming you set it to 100% earnings). I'm not sure that this makes sense so here is an example:

Take 1000 impressions with an RPM $2 your earnings are $2, then you apply ad-balancer at 20%, now you have earnings of $2 / 800 impressions * 1000 = $2.5 but your earnings are still $2.

In theory by hiding many of the low paying ads users should be less distracted by them and thus could focus more on the ones that remain. This should result in an increase in CTR. In my experience this has not happened in any measurable way.

You can easily set up an A-B test in Adsense go to Optimizations -> Experiments.

The other big secondary benefit is that greatly reduces the number of ads to review in the ad-review-center.