I subscribe to the Economist and the New Republic, make donations to NPR and ProPublica, but as far as electronic only sources, I haven't felt inclined to purchase any so far. And, quite frankly, I don't see this changing in the near future. Once micropayments are integrated into news sites, though, I will gladly pay an amount if I like the story. I have no qualms of clicking a button and sending $0.50-$2 for a very well done, in-depth story that I appreciate, but this feature just isn't there.
I want to support quality journalism, but no news site has floored me with its coverage and commitment to journalism to make me subscribe. I don't see this changing for major sites. For minor ventures like Glenn Greenwald's Omidyar site or Ezra Klein and Matt Yglesias' Vox site, perhaps. But even then I'd far prefer a method where I can support exactly what I want to support.
This is the exact same problem record companies had to encounter when the pirates hit. Consumers do not want to buy a whole album for one good song. Even they begrudgingly adapted, and media organizations should as well. They can have their click-bait fluff which will get ad revenue, but rather than using that to subsidize quality journalism, why not let the consumer support that sort of journalism directly?