You bet, there's a lot of opportunity for him in that experience. For instance, he will get to understand the phenomenon beyond the cliches. He makes contacts in the growing field. And he has a sample of a speech in this category for his portfolio. Currently, we are our portfolio. If there are not examples in it on supply chain management, it's unlikely we will get assignments in the topic. You bet, that's the new Catch-22.
What dims the sparkle of the incentive is that the client only wants to pay the guy peanuts. We know from The Great Recession that starting low usually doesn't mean that compensation will increase significantly. Starting low more often means staying at the low end. This is not a build situation.
However, not all opportunities are created equal. BigData is a build situation in that the knowledge base and the writing sample can be leveraged with other prospects. The low payer will soon enough be history.
So, yes, I recommended to this speechwriter to suck it up. Earn little but learn a lot. Take the sample and run. Nicely, ditch the client. That is done quite efficiently by announcing an increase in fees. Money talks and it tells that BigData professional that you have moved on to a higher tier.
Caution: Playing at the low end is risky. I invested six months in clean energy. That hasn't paid off. At least not yet.