[a5seo]

Linkedin has sort of tried this w/ premium accounts. 3 InMails for $20/mo. Not sure if premium accounts are really driving their revenue as much as recruiter solutions.

[diego]

In Q2 premium generated $43M. Not the $121M that Hiring Solutions made, but still not chump change.

http://press.linkedin.com/node/1223

[corin_]

Worth noting that "InMail" credits aren't the only benefit of a LinkedIn premium account, and in fact of people I know with paid accounts very few of them care about this particular aspect.