If you feel comfortable enough to develop it yourself, then what’s stopping you?
Ater all, the salient attribute promoted by most CMS software companies is that "is a matter of drag and drop". Even dummies can do that. We say amen to that. On second thought, may be not.
When we encounter new stuff, the reflex now is to search the web for answers. And more often we end up in Wikipedia for more detailed results and knowledge. In the case of JavaScript, you might end up with more questions than answers.
You need to be cognizant of where to bring in appropriate measures to stem the tide of feral juveniles causing havoc on our streets and community at large .
WordPress a CMS created with PHP has been with us for a while and has a large following. In most if not all ISP's one of their salient feature is the availability of "WordPress".