From my personal point of view, I've done many small-medium projects. I'd say on average 3-5 experiments per week (trying ideas out on JSFiddle, drawing pad or just an .html) and 2-3 finished projects per month. My main motivation is to keep learning and trying new things so it wouldn't make much sense for me to hire someone for this.

I've thought about it though for documentation and testing, but then again doing it myself and because I was a student (so no $) I also learned a lot.

BTW, What kind of projects are we talking about? I'm freelancing now :)