This isn't directly answering your question - don't have an answer for that.
You said: "Adwords offers a bid estimator, but again this is not very helpful for a large number of keywords."
But are you breaking your KW into smaller related ad groups? This could help the bid estimator work better possibly, plus help you adjust your bids accordingly for the higher and lower cost words.
__________________
Your Partner in Success,
Linda Buquet :: Affiliate Program Advertising, Promotion & PR (Publisher Relations)
The free forum support we provide is made possible by all the 5 Star programs at the
top of the right sidebar & in the directory below. Please visit & support our merchants.
5 Star Affiliate Blog :: 5 Star Affiliate Programs Directory
|