To be perfectly honest, I wouldn't pay anything for it. The perception of most users is, you can get a free digital subscription to anything on twitter. Just click "Follow".
The trick is to find the really good accounts to follow. To make that easier, I wrote a tool you can use to find the exactly the twitter account you're looking for: http://www.find70.com
As a dev I pay for a lot of services (AWS, Digital Ocean, Github, etc). However, on my personal life the only paid service that I consume is Netflix. Everything else is free. Can you compete with free?
Beautiful typesetting, high quality articles, good editing, smooth and convenient payment.