It's a little late in this thread, but I will share that I had a bad experience with a commercial MUD years ago (don't remember which, now) which wasn't clear about having fees. I played for several days, and then started getting messages about my time expiring and my needing to purchase credits for further playing time.
I was disappointed and felt slightly taken advantage of, because information about required payments to continue play was not made clear on their website--even after I got the messages and looked on the site, I found something about credits but no information about the requirement to purchase them in order to play.
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