If you don`t know about something please don`t say anything....
CPMs are due to rise
40% this year alone. they have not "crashed"....
YouTube Monetization does not off CPMs but instead ad clicks and views, this is because YouTube can`t sell the good ads because they have to sell so many, more often than not they sell lower paying ones and as a result partners would not earn much if they were to start paying per 1000 views.
As a network partner, only 0-30% of your ads will be sold by Google (depending on the network) Networks sell ads onto their CMS, via Google Adwords, they often get all the good ads because YouTube has already taken the bad ones.
If a network is smaller it means they will need to sell less ad impressions , therefore CPMs will rise as they can spend their time scouting out higher paying customers and deals.
When RPM lets all these small partners on board it will indeed drop Maker`s CPM rates across the board