i assume some 0.1% of google users have toolbar installed
I think it would surprise us all how many people do have this. How many non techie [people are out there and have installed it by mistake, have installed it as part of the package (you know, would you like to install the G toolbar as well-hey I've heard of them-seems like a good idea etc etc).
Also I would suggest that the technology to convert this into "intellitext like" links taking away the need (i.e. the revenue splitting) with a publsiher isn't that different.