Agreeing with the other reply I saw, no, Seeking Alpha writers are not paid AFAIK.
However... as with anything on the internet, be very careful in evaluating the pedigree of the writer. One particular one comes to mind - a guy who wrote article after article about the soon-to-be liftoff in E-Trade's stock price (which never happened, btw). Every month or so like clockwork it was E-Trade or some similar stock.
You could read his story history and see what was going on. Eventually he was repeatedly challenged and quit writing his stock pushing "opinions".
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