Primal doesn't make any money on iOS in-app purchases of sats. Apple charges 15% in U.S. and Canada (30% elsewhere), Stike charges 1%. Apple might apply additional sales tax per their local app store rules. 

These aren't cheap sats. The option is there so that newly onboarded users can experience Nostr zapping without friction. We deliberately limit these in-app purchases to $5 at a time and $50 max per day.

Note that the "receive" function on the Primal wallet works as soon as you activate it. Users who already own sats can load their wallet that way and zap away! ⚡️