seoguy: Number one on google but earns low

Thats not possible... or your website dont have quality for visited so check your bounce rate .. if high then try to maintain bounce rate ... to increase money count

what`s the amount of traffic you`re getting?

What keywords do you search for that make it number one in searches?
Also, being number one on Google doesn't really affect earnings, it's traffic that's the key. If someone reads the Google description of the page and decides that it's not what they're looking for, then they won't visit.

The keyword is very important.

Example being the 1st in google for how to lose weight fast and personal trainer singapore are different even both keyword are the top because the word "how to lose weight" global have more then 200000 exact search a month compare to the word "personal trainer singapore" only 2000 exact search a month.

Well it doesn't really matter if you are number one for a specific keyword if that keyword doesn't get much searches, therefore you will not get traffic.
Low traffic = low earnings

If are on no 1 for any particular keyword that doesn't mean,you'll earn good money,it depends upon traffic,the more you have traffic the more you'll earn..

If you are on no 1 position for any particular keyword that doesn't mean,you'll earn good money,it depends upon traffic,the more you have traffic the more you'll earn..

If the keyword has low CPC then you could be getting low earnings although that is not always the case. Have you placed your ads for good click through rate?

Use adsense high paying keyword your cpc value increase

I think you must do the keywords research. If you want to get the proof amount, use the HPK for increase adsense earning.