I didn't get paid to write here until Movie Insider rolled around, but was able to use CHUD as an outlet to get access to junkets, screenings, interviews and set visits that I subsequently sold under fake names to magazines in the UK, Germany and, in particular, France as well as a few other places here in the States so I didn't have to work a real job while trying to break in as a screenwriter and, of course, got an education in how movies work while I did it. I'm not saying that writing for free online is the be-all, end-all, but if you're mercenary about it and can figure an angle (and in my case, be fairly ethic-less about reselling the same quotes - totally got busted once on doubling up coverage of the "Dawn of the Dead" remake in two UK mags), hey, it can pay.
Jules Feiffer, in his autobiography published this year, talked about contributing weekly "Sick, Sick, Sick" strips to the Village Voice for years and years hopelessly unpaid and found unusual ways to have it pay off for him in other ways that led him to be successful as a cartoonist. But he got out there and pounded the pavement.
If you want to write, having a platform that's already getting traffic is not nothing. Figuring out a way to get paid on it, I suppose, is a way of separating the wheat from the chaff. What's that thing Will Smith said here or there? There are plenty of people out there more talented than him, but he'll beat you every time in busting his ass to get out there and promote as no one else is going to do it for you.