Unfortunately there has been a trend lately on Slashdot where the editors accept a lot of stories from people linking to their own site. I guess this is acceptable in the Twitter world but doesn't match a meritocracy where users submit interesting stories instead of pumping up their page views.
I don't think the editors have a choice in the matter. Slashdot is corporate, thus it must deliver bigger numbers every quarter or be labeled a failure and discontinued. Finding a niche and delivering a steady stream of eyeballs to advertisers isn't sexy with higher-ups, because they in turn must deliver exponential growth to shareholders. But exponential growth is only possible when you're way below what the environment can support, so the staff implements random changes to be seen doing something, which in turn end up driving existing users away.
People need to understand that the Web is not the frontier anymore. Dotcom bubble came and went, and sites like Slashdot are mature (boring) businesses which simply aren't going to grow significantly anymore. Put them into maintenance mode and use their steady revenue as venture capital to fund developing new, exciting things.