I would object against naming HuffPo as a good example.

1) They are not profitable.

2) Quite a few of their articles are just rewrites of other journalists work. They read article in other media, and then re-tell it in their own words. Which of course is much cheaper than to really report. So they are dependent on other media in their operation, and also the point 1) applies.

p.s: I don't have anything personal against HP, I just think they didn't prove anything yet.