I've never noticed a lack of or inclusion of pay-to-subs on duotrope, so I can't speak to that. *But no, I don't submit to those markets. *And no, I don't think it's the way to go or the right thing to do, but nor is it the industry standard.
That's like having a discussion about agents with the same peramiters--major fee charging agents are often scammers or incompetents. *They are not the standard, they are so fringe they cannot be talked about in the context of the proffesional publishing industry--because they're not part of it. *And yes, they are to be avoided.
Should I have said that only scammers won't be honest about what they do with slush? *Ok, maybe. *But like your jest, I thought that was obvious.
You've argued about editors reading (or not reading) slush before. *I'm not sure why you're so hung up on the idea that the slush isn't getting read (You cited rumors about Tin House and Zoetrope as proof that there are pro venues that ignore the slush--even though another poster pointed out they knew people who had been published in one of those venues via the pile). *
Or maybe you're not hung up on it, but it's coming off that way. *
ETA: Ignore all the asterisks--the formatting is wigging out.
Another ETA: I personally feel strongly about this subject because claiming that a story was never read is a common excuse dished out by new writers who want to find anything to blame for a rejection other than the story. It in no way helps them become a better writer, and often keeps them from doing so because they're hyper-focused on finding outside sources to blame for their lack of success.