very very very inaccurate
Dave, I think you left out several "verys".
The traffic/cost estimator either tells me .05 or something like $11.47 for every adgroup. Experience has told me that something like .16 will keep me in the top 4 positions for any of the keywords.
I think that estimator only works properly for certain very competitive areas with a long history of data. If you're going to go into those sectors, you need to have done prior studies of your own to have a chance at being competitive, not that tool.
patient2all
You can point the clicks anywhere. Yu could use a competitor who already has GAW. They'd be scratching their heads, wondering where the extra click spike came from :-)
This is the only way I know that lets me tell a client what the bidding, positions, and clicks will be like.
SN