Speaking as a developer, I think I can see the analogy between dev and marketing. But from a learning perspective, software development has a big advantage. You can build everything from a hello world app to your own toy OS without being negatively impacted by existing software out there.

As a marketer, it seems like you always have to be on the cutting edge. What worked in the 1980s is unlikely to work in 2012. Even what was cool in 2008 is unlikely to be effective today. The next problem is that marketing is, by its nature, a public activity. Doing it badly is embarrassing and likely limits your ability to even give it a second try.