On this one, I'm cutting to the chase:

SABOTAGE #6: ASSUMING A WORK DEEPLY FELT BY YOU WILL BE DEEPLY FELT BY ALL

This is a strange one. I always feel a little mean mentioning it, and I also feel like it's painfully obvious. Yet again and again, without fail, at every writing conference, I meet a writer who assumes I will be interested in their work simply because it's about a transformational or life-changing or soulful experience. Writers who are so wholly consumed—who have become different people because of the ideas or story they are conveying—tend to automatically assume it will interest editors or agents just because it’s something they know or deeply experienced or worked hard on.

Unfortunately, it’s not enough to have written a great work, experienced a life-changing event, or be an expert in the field. You may feel you have an important message to share, but you have to be able to connect that message to an identifiable MARKET. You must be able to establish a readership and a market for your work if you want to interest a commercial or for-profit publishing house; nothing else will matter to them, apart from amazing, fall-off-your-chair writing.

In big-picture terms, I'll quote the great philosopher Schopenhauer:
"Most men are so thoroughly subjective that nothing really interests them but themselves. They always think of their own case as soon as any remark is made, and their whole attention engrossed and absorbed by the merest chance reference to anything which affects them personally, be it ever so remote."