Apple's charts are based on impact, not actual numbers. You need to make ten or 20 podcasts before you even launch. And if you're doing the work for some one, who cares what the chart says? That's not why we do creative work, right?
In his third Design Matters interview, writer Seth Godin riffs on his 20th book—“The Practice”—a milestone text exploring creativity and the sheer power of doing the work and putting it out into the world.