londrum - 2:41 pm on Nov 24, 2013 (gmt 0)
i had a bit of a disaster trying these experiments. i let them run for about ten days and my earnings plummeted. the experiments which ran to conclusion just told me what i already knew... text ads are better than image ones.
i have stopped all of the experiments now and my earnings have returned to normal.
i don't mind these occasional hiccups though, because it gives you a chance to look at things afresh... moving a few ads around, changing some of the sizes... there's nothing like a big earnings drop to remind you that you can always do better!