I've read advice from many prominent writers in which they pontificate that having a regular day job can actually help with your writing. It provides valuable inspiration. I don't know about any of that, I work because I have bills to pay and I enjoy eating. Writing is something I have to make time for on the side, in hopes that it will one day be my only job.
I will admit that I do get a lot of my inspiration from my daily life and the experiences and actions of the people around me. I often find myself channeling my frustrations in any given situation into a piece of writing. The two are connected. I don't think I'd have near as many ideas if I didn't work around people as much as I do. People are strange creatures, and one can spend their entire life trying to understand their motives.
I'm still hoping to one day have writing as my only job, but until then I can appreciate my day job for what it brings me, money to pay my bills and buy food, and loads and loads of inspiration.