Ill just copy-paste what i wanted to say in the other thread i'm too tired to change the post.

I think the way to would be pay-per-in-game play time.
like you will pay 18$ for 360h of gameplay (15 days). this means that a hardcoe player that plays 5h per day ( trowing numbers as i don't know how much a hardcoe player plays per day) will need at least 1 month and 10 days to renew the Subscription ( probably before tho'. maybe precisely 1 month) . And those that will have less time and will play 2/3 hours per day, will need at least from 3 to 2 months to renew the suscription.
maybe even putting an option to adjust the hour based on your needs.
Or, a subscription fee that makes you pay per hour ( like someone said, pratically like "playing" with btches
