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It is an old theory that accurately points out Marketing/Sales division people inevitably out-compete product innovation people in a successful firm.

And yes, the Steve Jobs interview does document how this almost destroyed Apples core business. =)

Just to clarify do you mean employees marketing and selling their innovation skills or people literally in marketing and sales?

Shameless self-promotion is usually not a problem in most commercial settings. Sad, but true... lol =)

Letting Marketing/Finance people set technological product trajectories sooner or later becomes detrimental to large firms.

i.e. the product line becomes disconnected from the consumers actual experience of utility, novelty, and perceived scarcity. =)