Because it's not what the cool kids are using.

I was at a conference where pud spoke. As for using a "startup" worthy language versus what you feel most comfortable in, he said (more or less a quote), "98% of all web sites fail, and yours probably will too, so might as use the language you want and are most productive in"

Indeed. You wouldn't want to risk compromising your fractal of failure by throwing a successful technical decision into the mix.

http://me.veekun.com/blog/2012/04/09/php-a-fractal-of-bad-de...

I'm sorry... it was just too, too easy.