Opinion wanted - links away from a website?

I have a client who has a certification logo on their site. When I asked if they wanted to link it to the organization that gave out the logo, they responded that they'd read that links that drive people away from a website are counterproductive. The certification logo website does not compete in any way with my client's site; rather, it would provide clients with more information about that certification. It's not anything different from linking to a Better Business Bureau profile or a social networking profile, in my opinion.

I guess my client is just concerned that it would distract people from clicking through the rest of his site. I just wanted some other opinions. Thanks!

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