MMOs in general are very good at investment/achievement trapping users. SecondLife also is but their users will spend pretty large sums, I've seen users some 3 grand in (before land), owning small amounts of land will cost thousands up front and a few hundred a month to keep it going. It's going to be hard to leave that behind.
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I played for a summer between highschool and college. Great fun for a student in IT or some sort of graphic design. When I cashed out for the start of the school year it was enough to cover college books (not a lot for the time spent, but better than my friends got from Warcraft).
As a 19 year old it was also great for meeting older generations on equal social ground, and picking up some freelancing habits when the risks were less than $100 or so (and nothing but hobby time for both parties).
But no discussion at all ...
https://news.ycombinator.com/item?id=14379620
https://news.ycombinator.com/item?id=14381676
https://news.ycombinator.com/item?id=14381905
https://news.ycombinator.com/item?id=14382750
https://news.ycombinator.com/item?id=14386221
https://news.ycombinator.com/item?id=14388089
https://news.ycombinator.com/item?id=14388862