Thank you for that link. I'd never heard of Duotrope and will take a closer look.
I've had only one book rejected, and the odd thing is that it was the publisher who reached out to me. He asked for a story outline and four or five sample chapters, which I sent off — and then heard nothing. I'm aware of shady companies that do something similar as a way of picking up free content, but in this case it was a reputable publisher.
A colleague tells me that the vetting procedure for submissions is getting more and more complicated, and taking more and more time. If she eventually receives a rejection, she usually puts her work into the public domain by uploading to an appropriate site. No royalties that way, but a far greater readership.
Seems like an opportune time to repeat SF writer Robert Heinlein's writing rules for success:
Robert A. Heinlein's 5 Rules For Writers
1. You must write.
2. You must finish what you write.
3. You must refrain from rewriting, except to editorial order.
4. You must put the work on the market.
5, You must keep the work on the market until it is sold
Number 3 is generally interpreted nowadays to be "don't tinker with it endlessly" i.e. edit to the best of your ability, but at some point realise you've reached the point of diminishing returns and if there are still errors, the publisher will point them out ( there again, some of the published stuff I've read...).
Heinlein didn't have any problem sharing these rules to success with his would-be competitors, as he believed most of them would not follow them through anyway.
For instance, 100 people want to be writers. 50 of them will sit down and write something. 25 will finish it. 12 will get to a point where they stop tinkering with it. 6 will submit it to a publisher. All will get rejected. 3 will overcome the rejection and try other publishers, and start work on something else. How quickly you get to the (good) pointy end of wannabe writers even before you have anything published. And the abilities of the writer aren't even a consideration at this point - great stories and writing get rejected, don't we know this?
A good lesson to take from this is to start with short stories or website/newspaper/journal articles. Forever slaving over a novel that is your first attempt in the hope that one day you will be successful with it, is probably not the best approach.
Not that I'm an expert, but at least I've played the game, had some small pieces published, and have been paid for it, albeit only token amounts $5, $10, $15 kind of thing.