I'm the opposite actually. I wish I could do full color, full-paint. I started a comic like that once, but the sheer amount of time I had to worry about coloring and shading, then blending and special effects like glinting metal, or... just backgrounds were an absolute nightmare when they had to be painted and colored. Characters not so much, but backgrounds were almost painful. I burnt out FAST.
I dunno. I prolly wouldn't change mid-comic either, but that's just because it would visually bother me. XD Forever. No matter what. I pretty much went "I'mma do this in black and white because it's faster, more efficient, and works with my genre anyway; and just for fun I'll color splash it occasionally" and committed. >.>