Do whatever you want! I encourage people to write/record music THEY like.
I don't think commercial music is all crap or watered-down to please mass audience. Even if it IS, I think there's a time and place for that kind of music just as there is anything else. But music, whether commercial, purely artistic, or anything in between, is I think an ongoing dialogue. If you WANT to speak to a mass, popular audience, do it. If you want to do bluesy post-punk, do it. If you want to invent something never-before-done. go for it.
My thing about my own music is there's just nothing out there that holds my interest for very long. So if I wanted to listen to music that *I* like, I have to create it myself. It's ok if nobody else ever hears it, although I don't mind sharing. It's ok if nobody else likes it. It's enough for me to be creative, and it's always a fulfilling endeavor.
As far as what's out there I actually DO enjoy, I've been into Tangerine Dream and a lot of Krautrock, New Age, some world music, some jazz, and tons of weird electronica from all over the place ever since before I was a teenager. It was distressing I couldn't make my own instrumental music and get a full band to back me up. That is, until I talked my mom into buying me a Yamaha QY-10 for Christmas. =D I've been leaning more towards a more pop style as of late, but privately I'm into Shoenberg and Webern. I think your bluesy post-punk idea is a great one. Now if I can fuse 12-tone, integral serialism with Krautrock-inspired ambient downtempo to knock out an instrumental album based on sacred Christmas music with a sound inspired by TSO and get a few thousand senior citizens to buy it, I'd REALLY be in business! lol