500 learners definitely isn’t the whole of Memrise. I expect (athough it isn’t clear there) that it actually means top 10 for the specific course you’re taking.
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The problem is that how can I be on the top 10 only after taking one course.
It could be that, but it didn’t say that. I also got a discount for pro version.
You are in top 10 weekly in the course you are taking.
I just checked.
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This is a top 10 for this week, so starting on monday. Since today is only tuesday, this doesn’t seem too difficult to achieve.
As @widle said, it’s probably only for the top 10 of the course you’re taking. There is probably also another condition, like “this course needs to have at least 500 learners”, according to the e-mail. I started receiving the same kind of e-mail every week after I chose to study an old course for french native speakers with a lot of learners but not so many active people in it. You shouldn’t worry too much about that. 
Thx
You can get this message pretty much weekly, if it annoys you a bit then it’s a good idea to click “unsubscribe” (unless you want to claim the discount of course).
I got this email today as well, but I’ve never gotten it before, so it seems new.
I’m taking lots of courses. I’m in the weekly top 10 for several of them nearly every week. I’m in the monthly top 10 for several of them nearly every month. I’m in the all time top 10 for several courses as well. So if this were an email you get whenever you’re in the weekly or monthly top 10 for any course you’re taking, I should’ve been receiving piles and piles of these emails by now, but I don’t remember every getting one before today. And the email doesn’t mention any specific course.
I’m not annoyed by the email, just curious. Something is new. But the email is too vague to figure out what.
It mentions 500 learners, so it probably does not get sent for less popular courses. Have you reached the top 10 in a popular one before?
I got an automated email from memrise today that says “Congratulations! You have reached the Top 10 on Memrise Leaderboards”, which made me curious to see what this leaderboard is. I know there’s a leaderboard for each course, and I know I can view one of all the people I follow, but this email seems to be talking about something global to the whole site. Is there such a thing? Where?
Probably just bad wording, if it’s the same as here:
Oh, thanks, I actually remember seeing that a long time ago, but forgot about it. But that can’t be what this email is about, because I’m not in the top 10 for week, month, or all time on that.
I’m not sure what specifically triggers the email you got. I recall seeing several posts on the old forum asking about it and, I seem to remember several people saying they also got an invitation to sign up for Memrise Pro at a reduced rate in tandem.
I think it’s just a bit of Memrise ‘encouragement/marketing’. 
This is confusing. Did someone merge two different comment threads into one? If so, would you please un-merge them to make this sequence of comments less confusing? Please? Merging different discussions will-nilly causes confusion and frustration. Better to have them link to each other than merge them.
@widle - I’ll respond once these two threads are un-merged, or if they can’t be un-merged, I’ll start a new post.
that general leaderborad is crap, sorry, everytime when i make the mistake looking over it, i see some cheaters…
Yes, it was me. It wasn’t my intention to cause distress or confusion, only to avoid having two different threads in two different categories dealing with the same issue.
I realise that merging (which automatically closes one thread) without explanation is probably not the best way to go. In future, I’ll post to let people know what’s happening.
Agree!
I am getting it from time to time. I got it yesterday I think.
It’s just a reminder that you can go pro. But if I’ll get the ability to pay for the service, I’ll check for that 50% off, to see if I really get it.
It reminds me on that fake actions at our supermarkets, when they high the price of some article, and then put the OFF on it and then it has the same price as before.
Since this never got un-merged, I re-created my original post anew: