TheMadScientist - 11:03 pm on Nov 29, 2012 (gmt 0)
I'd sound cranky too Backdraft7, for sure, and this isn't my first user name either ;)
Part of the reason I jumped in is what I saw years ago, but didn't post about at the time, and partly decided to now because just this discussion is 300+ posts with no solution or fix or workaround presented from what I've read and the discussion I skimmed still seems to be revolving around the 'if' rather than a 'fix'.
'If' doesn't seem to be anywhere near as important to me in this type of situation as a 'fix', so assuming it's happening and assuming it's going to keep happening, what's the workaround to the situation?
I know the businesses I worked with made some adjustments when we saw the cycles, one of which was to seriously dampen PPC spending during the 'sales drop' periods, then ramp up again just before the purchasing period and begin tapering off again just before the end of the purchasing period to save on spending when we knew there would be no corresponding sales, but the items they sold had a longer sales cycle than some 'buy it now' type purchases, so that exact pattern might not be a benefit for everyone, but I think it's something to look at, especially if there's a definite, predictable 'cycle' to the on/off periods...
ADDED: Basically, we really 'shuffled' PPC spend budgeting to maximize the purchasing period we saw and let the 'down time' go ... The highest spend days were actually just before the sales period started and the first couple days of purchasing, because we knew there was a longer sales cycle, so a heavy spend going out of the purchasing period didn't make much sense.
Shaddows observation about the InktomiBot is interesting too, in my opinion.