My eye for what will be successful when it comes to my writing is terrible - a blind spot if you like.
Case in point, my SIGILS AND TOTEMS idea.
BROKEN SIGIL, which was my first entry in what I hoped would be a breakout idea for me, was pretty well received, but it's been a case of diminishing returns with the rest of the works since then. PENTACLE and THE JOB slipped quickly into obscurity, and my big hope, the novel SONGS OF DREAMING GODS, has similarly sunk without much of a trace with only a couple of fairly lukewarm reviews to show for its passing.
Some of the short stories using the concept have fared better, but on the whole, I think what I have now is a dead duck. I have a longish list of ideas to stretch the concept in different directions, but unless something changes, and I don't think it will, they'll never get written. As a full time writer, I can't afford to drop any more effort into something that's not selling.
Which is a shame, as I really, really, thought I was on to something.
Shows you how much I know.