Limiting yourself to the Internet
As absurd as the question is, most people do not realize that what they are learning is not "Internet marketing", it's "marketing".
Sure, the tools may be different, but if Al Gore decided to shut off the Internet tomorrow, I would be just fine using my knowledge in other mediums, like print, direct mail, TV, radio, etc.
Stop thinking inside the box so much!
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"May I have ten thousand marbles, please?"
Founder of JVZoo. All around good guy :)