Like, if I get.. 1000 impressions, and only 10 clicks, is it lower money then if I got 10 clicks and 300 impressions?
If it's on the same site, there should be no difference. Either can produce more income than the other, depending on which ads the users clicked. You can get more money for impressions of ads that haven't been clicked, so having 1000 impressions is better. But CPM in most of the niches is very low, so the difference will be minimal, thus the 300 impression can still bring you more income.
on 1000 impression getting 10 click is ok, it is 1%. It is always not happen every one your web site will click on advertisement. Please do not forget many people has advertisement blindness.
I have my ads on another site that literally gets 0 clicks, is it a waste of time just having it give impressions then? Since as tamaras said, PSA would come quicker? (Both sites use the same keywords)
I dont know exactly how google adsense earnings was compute... all i know is that we get ean when someone click on the ads and/or when we get thousands of traffics.