Mostly because Thread::Sociable languishes.
Because I haven't won the lottery or inherited a large sum of money recently, and no one seems inclined to write checks sufficient to support the effort and resources required to complete it.
Because the Perl(5) community seems content with fork and pipe.
Which means I have to apply myself to other, more mundane, albeit profitable, pursuits, because its difficult to get a decent wifi signal from a refridgerator box on skid row.
All of which is a damn shame. A recent thread on the Groovy lists pointed out a couple people presenting on concurrency models for Groovy. Based on concurrency stuff being added to Java, and soon, to Python. One such presentation is planned for codecamp. From which Perl appears to be completely absent.
Which is (in part) why I'm spending more time reading Groovy books and maillists, than reading about/doing Perl these days.
Perl Contrarian & SQL fanboy