My Second Castbox Advertising Experiment: Was It Worth It?

What changed between round one and round two—and why

Hey Besties!

If you’re new around here, I occasionally run paid advertising experiments for my podcast—and then analyze the results behind the paywall.

In July 2024, I ran my first Castbox campaign. In November 2025, I ran a second. Were they effective? Were the results different? Why? Would I do it again?

If you care about podcast growth, ad ROI, and whether platform ads are actually worth the money, the full breakdown is behind the paywall. And lucky you—this week, I’m running a 20 percent off sale.

Let’s get into it.