Should I do mediocre work for money ?

I work as a freelance web designer. I strive for my designs to be unique and original. And I actually love being creative. Most of my clients are turned off by any type of design that does not look like every other website out there. They want me to simply copy the crappy looking sites out there, make some changes and give it to them. Doing so is pretty easy for me and I could make a decent amount of money with this method. But the problem is – I have ideals. Lately, I have been getting more and more rebellious when it comes to design and simply refuse to do such mediocre work.

The simplest way to sum up situation would be:
Should I be Peter Keating or Howard Roark ?