You want a 'specific reason' regarding Adsense?! I seem to remember asking this same question myself a little while ago. There was some speculation but the simple truth is that I will never know for sure.

On occasions I've seen multiple clicks for 1c so maybe one click isn't enough to pay 1c, hence nothing. Alternatively, Google - for whatever reason - deems the click(s) to be invalid, hence nothing.

All we can do is speculate.

Also, I don't think all the stats update at the same time - sometimes the clicks come through but the impressions lag, and vice versa. Might be the same with the earnings as well.

The niches are higher paying, but I guess it is possible. Maybe it just needs to update. I usually only check last 24 hours reports and will notice this sometimes. I'll give it more time or start checking older stats (like weekly) Thanks for the help.

CWebguy

[edited by: CWebguy at 3:36 pm (utc) on April 8, 2009]

why you would receive clicks but not earnings for those clicks?

Usually it's for CPM ads.

Usually it's for CPM ads

Ahhah, now that makes sense.

[edited by: CWebguy at 8:08 pm (utc) on April 8, 2009]

Actually, I think CPM ads would show earnings but no clicks, not the other way around.

Are we talking a lot of clicks here?
Could be that some visitors have been double clicking or weaving backwards and forwards from you to advertiser > back to you again

so a double click is not counted? I would have no idea of knowing, but I guess it could happen

I've always experience also. Clicks with no earnings.