Those stats are Duotrope are based on a grand total of
13 responses over the past year. I wouldn't place too much faith in them. For one, I've submitted three stories to BG over the past year, all have been rejected, all the rejections came fairly quickly (within a couple of months), all were personalized.
The editor's responses have made it clear that new writers in the slush don't have much chance of breaking out anyway.
This is true for all pro markets. Realms of Fantasy has an acceptance rate (according to Duotrope) of 0.7%*. F&SF has a rate of 0.18%. Fantasy magazine has an acceptance rate of 0.53%.
I've lost count of the number of times I've been knocked back from F&SF. I managed to get past JJA once in four years. Fantasy have never given me anything but a brush off. Clarkesworld the same.
Most markets at the pro level are just not friendly to S&S (or at least, the kind of S&S I write). They may say they are, and they may take the occasional story (although I subscribe to F&SF and the last S&S story was . . . some years ago), but it's not their focus.
Black Gate's focus is on adventure fiction. They're probably the best fit for an S&S story. It's very
very hard to sell to them**, but then you're competing against the best writers in the field. If you sell to them, you've written a damn good story.
*although I'm not sure if this is right, either. Doug posts the number of submisssions he receives, and from that you can work out the acceptance rate (given the buying rounds are normally for two issues). I think it's a bit higher than this.
**I've sold them one story, from more than ten (fifteen?) I've submitted to them. And that's over four years of trying.
Just my 2c, please don't jump on me. I don't think Duotrope represents everyone's experiences equally. (Doesn't represent mine, f'r instance.)
Edited to add:
I don't want this to begin a 'this place is better than that place' kind of thing, because that would suck. The only markets I've submitted to with good response times haven't bought from me.
So I'm kind of wary about using response time as a marker of where to submit to. In my experience, faster response times just means faster rejections. YMMV.