It can be a temp solution to our current depopulation. I also see it (if coded in a smart way) quite dynamic: the "shop" to be adjusted based on certain factors (some brainstormed ideas below):
- if there are more MP3s logged in, the cost of the items increases, if there are less, cost decreases
- certain things can be available only in certain parts of MD (encourage travel)
- certain things can be available only when for example an MP4 or an MP5 (or a combination of numbers of those MPs) are online - same for the costs
- as MP3s age, more items are available (but maybe at a higher price)
- i still like my achievements idea as it's done based on MDs history and can be a good way of teaching people about the past in order not to repeat the same mistakes (yes, there are tons of stuff I'd do differently - in a worse way, of course!)