About how pay per click

i start second site and stats drop

[tazmaniak]

Hellol
I just wanna question
its posible this or im wrong
I have site and him average stats to 16 november this month its very good.
But when on 16 november i start my second site with google adsense from 16 to now [29] average stats for first time its same about impressions and clicks but my earning average per day its droped 2 times more little.
Its this posible becouse i start another site or what?
Big Thanks and Big sorry for my english ;-)

[GuruSense]

if your second site is the same advertisements then your issue is that your effectively 1 site and your basicaly causing more impressions on the same ads and maybe its catching on fire with this factor.. too many hits little clicks will result in seemingly low CTR and pay wont be so cool.