Cold Turkey products are a one time payment. Each purchase includes free updates forever. You do not need to pay again.
Subscription based models are good for business. But as someone that's also forced into subscriptions, I know how annoying they are!
My goal is to charge once at a fair price so that you don't have to constantly evaluate whether or not to continue using my products. This will let you get long term value from Cold Turkey products and stay productive longer.