It only needs reporting once. If you write "reported" on it, everyone will see that it has been reported and won't do it again. Then it will go to the bottom naturally. Otherwise everyone will report it, and probably someone will comment as well, and it will stay high up. I'm sure Megan will blat the spam as soon as she can.
Goodness. That needs streamlining, doesn't it? Thanks for explaining.
So the best thing for you is for the first person to spot the spam to click Report, post "Reported - don't report again" or some-such, and that's it? No more reporting, no threads like this, no separate PMs, right?