250g wouldn't last me a week lol.
I'm not sure why they have all the mystery tbh, it's a bit suss. Surely they could just list where and what they have and let you order as and when (as well as do subscriptions to those who want it). I don't see the need for a subscription, it's a bit of false exclusivity or something. Like that annoying "shh don't tell anyone, even though this is a TV advert" holiday company.
HasBean, Rave, Pact.. they all do what Kopi do - travel around and buy what good coffee they can get before someone else buys it all up (fun fact: Coffee is actually a hell of lot more scarce than we might like to think it is and farmers are beating buyers away with sticks). Kopi won't be any different in that regard.
Obviously it'll be a different story regarding the roasting though. Though I'm not about to sign up for a sub just to see if I like their roast or not.