Guests and player versions

What Feature would you like to see included within TaleSpire?
What does it look like, how does it work, how is it used. Paint us a figurative picture.
I know people are asking for this and it's not yet on the roadmap, but the ability to bring in guests and/or provide player versions of the game is absolutely necessary before I can plan to use the game.

 This would likely be a code the full “GM” version of the game could hand out to one person and a less expensive player version that would only allow you to run a character in someone else's game, rather than getting all the editing tools.

What situations would this Feature be useful?
Descriptions, examples, interactions with existing features - whatever you can think of to get your idea across!

While $25 seems more than fair to me, I cannot request that people buy into that for a one-time appearance in the game and I know people who can't afford that and just want the ability to be a player.

Additional Thoughts/Details

I really like this product and would love to be able to use it, unfortunately the pricing system just isn't supportive of my playgroup as we are set up at the moment.