What is the etiquette for sharing Search lists?

As I consider my own Search in the growing Australian market, I have heard how hard it is to just find the businesses. While Search in Australia is still a budding investment channel, there have been a few handfulls of Searchers to date which, if they kept a solid CRM, means there is a handfull of lists of potential businesses. I understand that a Searcher's list would be unique to them based on their thematic interests, but there would undoubtedly be good coverage of many industries in those lists.
I also understand and respect the need to go through the "right of passage" of gritting through a Search, but as a whole I can't help but think that we could achieve much more by sharing resources.

What are people's thoughts on sharing Search lists of identified businesses?