Alexa+ pricing makes no sense. $20/month or free for Amazon Prime subscribers… Prime is $15/month. I can think of a few reasons to do it this way and none of them justify user confusion.
Seems like the motive is exactly what you’re suggesting: drive more Prime subscriptions by setting the Alexa+ price higher than Prime itself.

they want any Alexa user on Prime .. once on Prime a panoply of upsell opportunities
