Top of the line ceramic knives are expensive... here in the U.S., a paring knife made of ceramics is about $50 (US) as compared to maybe $30 for a good steel one. They have to go back to the maker if repair or sharpening is needed and, as already noted... they're brittle and easily damaged. They don't work well on semi-frozen foods sinc it's easy to damage the pointed tip...
I agree with seadogg wholeheartedly though... there's something very satisfying to reconditioning and then sharpening a good steel knife... one of the reasons I regularly shave with a straight razor (Sheffield or German only, thank you). Stropping a good razor to extreme shaprness is a fine art and the satisfaction shouldn't be wasted on the timid...