I've done some advertizig with AdMob in the past...spent around $ 800 so far and from an advertizing point of view this is not very much...it's more like peanuts I guess. Anyway, I didn't see a directly related surge in sales. I always had a peak in site visitors - so I had an effect...over time sales started showing a little bump on the weekends I did advertizing compared to thos I did not...was about 1 or 2% more...so my ROI so far has been pretty much 0. :-)
But on the bottom line I will continue to do advertizing...just to spread the word. I believ it will make a difference in the long run...
YMMV! :-)
Best regards,
Markus.
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