@Jeffro - Or he could aspire much higher and, rather than waste his time trying to hawk it as a paid add-on to the fairly small percentage of people who pay for plugins, he could offer the whole thing for free under the GPL and see his work used regularly by tens of thousands of people, possibly millions if it gets rolled into the core.

Having such a prominent inclusion listed in your resume, something right out in front of millions of WordPress users, would be a huge boost to any young programmer's career, worth far more than few hundred hard-won bucks he might manage shake out of the "premium" market.

I don't know why, but there is a craze these days for monetizing way too early, looking to cash in, playing the short game rather than taking the long-view of your life, your career and what you, as a person, are about.