Doesn't look like "CONSTANT" ecpm, as your title says. It's just one channel on one day. I've had channels with ecpm's higher than $1700.00 on several occassions. Two channels over $300 today. Doesn't mean much unless there's traffic. All you need are 6 page views, 5 clicks at $0.38 each, and you have the same 85% ctr at $331.00 ecpm
First of all, thats constant eCPM. But i'm sure Google will notice it and will apply smartpricing soon. But until that happens.......
Thats not true. Its all about pageviews. Making $400 is not biggie. People making over $2000 per day and still normal publishers. If you get 20 mil pageviews, then google will consider you to be premium publisher