For roughly the same reasons that I'm not using perl 5.8.x or 5.6.x. Also, while we're at it, the same reason that I'm still using Apache 1.x and mod_perl 1.x. It's because I've got about a million lines (give or take) of code running on 5.005_03 (and apache 1.x/mod_perl 1.x).
Not that we don't upgrade... we do. Admittedly, we're kind of behind with perl. We'd begun a project to upgrade to 5.8 late last year, but it unfortunately fell apart due to personel issues. It's coming back, but not the single highest priority at the momebt. But I digress.
The point is, I think that a lot of folks are not yet using perl 6 because they have jobs, and those jobs are using lower versions of perl. (Espescially considerring that there are most likely about zero jobs available using perl 6.)
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