Yes -- just search for the number of questions, both open and resolved, about Google Adsense and there are many.
I started Adsense when it was opened in June 2003 -- and yes the income gets better for some, but it may also decrease as some have seen, while others seem to have their income reached a peak and just stays there.
It will depend on how you continually improve your content, your traffic, your ad implementation, etc
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