Just to clarify, I did not say that IMers do not need list building and traffic gen skills; I said that some don't need it. For example, graphic designers, writers, CPA advertisers, and programmers all do not need lists. Sure, having a list would make them extra money perhaps, but it is unnecessary for them to have one. I suppose we could get technical about the definition of an IMer Another example: service providers don't really need to know how to drive traffic...they just need to go where customers hang out to sell their services.
Right now I'm going through Jeff Walker's PLM training. As a PLM (product launch manager), I won't need a list OR traffic. Other types of IMers which don't require a list or traffic would be, off the top of my head, copywriters and affiliate/JV managers.