But you're not locked in like people who already have had users sign up and give Chargify their credit card info, so it's much less of a big deal for you.

Good point, I'm currently testing their system but can walk away. I'd be seriously pissed if I was locked in.

Oh, well if you're testing it to the extent of having written code to work with it, you can probably email them saying you've already started integrating with Chargify and want the bootstrapper plan. But that's assuming you still want to use them.