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If I had to guess, it might be a matter of what particular combination of widget phrase trigered the ad as there are different values for different keywords within a widget topic.
Now for it to be worth 25 times or more than usual is very unusual :)
Where there any other clicks on that channel within 48 hours prior and afterwards. A good way to make sure that publishers can't figure out the value of each click would be to lump together some clicks one way and spread others so that they show minimum epc.
I've seen this on my site, presumably one click worth hundreds of times more than my normal gutter EPC.
I have very targeted pages that receive next to no traffic compared with my main content and when a visitor comes along AND clicks it's drinks on me :)
Of course the above is purely speculation as I don't use any tracking scripts or metrics other than those provided by Google but it's happened enough times for me to believe the above to be true :-)
I know for a fact that they do.
I used to log in to check my adsense stats several times in a short time span, so I have seen the value of one click in my account.
Of course the value varies but I was mighty surprised on a few occasions to see a single click increase my balance greatly. I guess it depends on your website niche. A niche with high PPC costs for certain keywords is likely to pay more.