You could probably pick up solid but cheap freelancers to join in (one of the magazine the publisher owns encourages community generated content and quite a few tech writers got a start through it) simply because it would mean increased output for them (not being at capacity like super-pro writers generally are) and hence more money.
But it's so so hard to compete with what the print mags would pay. We talked to a few freelancers who said they wanted at least 50% of what they would get for print - but twice the uptake (i.e. twice as many articles). That's hundreds of dollars per article you have to shell out for a few months before advertising picks up to cover it.
I think it's going to be tough to do this.
I saw they were promising payments, elsewhere, of 30-70K. That is "serious writer" territory and they aren't going to get any of them.
It was the ultimate reason I haven't emailed what looks like an interesting idea - 70K is such a ludicrous promise it sounds like they barely know the talent pool :(
(though maybe US journalism works like that, I dont know)