All along my site is doing quite well. Getting a stable average of USD75 per day. Usually the stats resets around 4PM. Now it's 1AM and I am seeing really bad numbers for my adsense stats. eCPM has been slashed half. EPC also went down. CTR remained around the same. I've already removed MFA sites months ago. I checked the ads and I'm sure that there are no MFA sites. I did not click them, just copied the link and inspect the website. Moreover, the keywords that is in effect now for the ads are "remote access", which should be getting quite good EPC and eCPM. Am I smart priced? I can't figure what's going on...
Well, income is way up for me (I think it's the start of the Holiday seasons ) So yea, something could be going on. On the other hand, there are up days and down days. For me the highest day is more than twice the lowest day in any given month.
the variation factor... probably the webmasters that have adwords on your webpage lowered their budget