Hi Cornelia.
Have you considered the following fact regarding the subscription compared to one-time purchase:
People will subscribe to play through the dungeon and maybe play through the other content as well. When they are finish, they will unsubscribe, and maybe come back when you release new content. If you don't make any new content for four months or so, then people will unsubscribe, and maybe subscribe again when there is something new to play.
If you do like EarPlay has done with CODENAME CYGNUS, then people pay for each new chapter instead. In this way, you will get money each time you release anything new if people are interested. With a monthly subscription, you will only get money, if people find it worth the trouble to keep subscribing each time you make something new. But if it's too difficult to unsubscribe and subscribe again when people are interested, then they'll skip it.
Just some thoughts and advice which I hope you'll consider.
Here is the link to EarPlay where you can check out what I'm talking about:
https://www.earplay.com/stories/
Best regards SLJ.
Feel free to contact me privately if you have something in mind. If you do so, then please send me a mail instead of using the private message on the forum, since I don't check those very often.
Facebook:
https://facebook.com/sorenjensen1988Twitter:
https://twitter.com/soerenjensen