I've never signed up for one of these monthly crate things, but that's mainly because they usually cost $40+ and look to be full of unwanted merch.
The Tonecrate isn't actually a crate, but a monthly subscription with Kemper profiles.
I like the current Rob Arnold (ex-Chimaira) offering, so the $17 per month sign up is acceptable.
I know I'm not going to love every months "packs", but if it goes that way, I can un-subscribe at anytime.
I have to say, I'm impressed by the idea for the KPA and pretty excited to see what comes of it.