That's only 63 impressions. You have to have more patience.
My CTR is 0.7%. Which means that out of the 20754 impressions that I've had, there have only been 153 clickthroughs. And of course, not everybody is going to buy.
I know that the item that I have listed isn't too sought after, so the CTR for some other things might be much higher (or lower).
I think the number of impressions is probably a lot higher now because of the AdSense program. Of course, you have to consider that people might be searching for 'mailing list manager' or something like that, but they might not be planning on purchasing a script, rather downloading a free one.
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