Calibrate ad density without nuking RPM

Calibrate ad density without nuking RPM
Benchmark: revenue per pageview peaks near 1 ad per 350-450 words, then flattens (n=140 sites, 28d). Past 8 units on a 1,200-word post, each added unit earns less than the prior one.

Unit count → incremental RPM gain
4 units ▮▮▮▮▮▮▮ baseline
6 units ▮▮▮▮ ▲ 12%
8 units ▮▮ ▲ 4%
10 units ▮ ▲ 1% (and viewability sags)

— Step 1: Count current units per template.
— Step 2: Add one mid-content unit, measure 7d.
— Step 3: Stop when incremental EPMV gain drops below 3%.

So what: The 7th unit usually pays ▼ 60% less than the 3rd.