Apparently it's some sort of "pro-am" site. I applied to be a travel writer and they, uh, picked me. I'm curious if anybody knows where examiner.com is on a 1 to 10 scale where "1" is "Application process? Everybody gets in, they're just scamming you for free content" and "10" is "ZOMG! You're writing for examiner.com? Wow, can I touch you..."
1 is correct.
See this overview on Examiner.com, and individual user experiences. It's a pay-per-click site - it's not going to earn you fame, fortune, or even a respectable line for your CV. If you want to write such content anyway, then the platform and pocket money might be nice; if you think you can leverage or promote your writing into some sort of success elsewhere, I suppose that's about as feasible as doing so on Blogger.
But you're asking about prestige of the venue, selectivity, about inherent career potential? They have none.