Podcasts are simply too good to be free - but they don't belong behind a paywall either. Tell your listeners there is an easy way to support the show and they will. Why? Because it feels good to give back value which was so freely given to us.
Building a large audience takes time and patience. With so many podcasts to pick from but so little time, how are you going to convince new listeners that yours is worth trying? Reward them with real money and grow your reach overnight.