Eu i-am intrebat anul trecut si am primit urmatorul raspuns:

Currently, it is not possible to use your Google AdSense earnings to pay for your Google AdWords advertising account. The two programs are distinct programs with separate billing systems. However, we are always looking for ways to improve the Google AdSense and AdWords experiences. We appreciate your feedback and will take it into consideration going forward.

Thank you for your understanding.
A trecut mult timp de atunci poti sa le scri la adsense-support [at]google.com