How does one become a playtester?

If it requires money and the power to keep things to myself, that works. 

During each of the three Kickstarters, there was an option to pay a certain amount to become a playtest, with the status of playtester carrying through to successive expansions, and even to the not-yet-announced new game.

I have never seen an option outside of the Kickstarters that allows one to become a playtester. If you're gung ho, you might try emailing Christopher: christopher@greaterthangames.com

I am quite gung ho actually. Thanks, I'll give emailing a shot.