I used to run an expat (and repat) meet-up, that I managed to keep 100% clear of bule hunters (and the like) and through it met half of my friends in the city (mix of locals and foreigners).
The others ones are not so good in my opinion (maybe I'm biased), because my one was always run by women it kept the bule hunters away (plus we vetted anyone joining who didnt fit the criteria). I get the impression some of the hosts in the other ones are making money from doing it somehow.
I keep saying I'll do the events again but honestly - it's so much work. Making sure a group of 30+ strangers are enjoying themselves is hard work. Making sure everyone pays their bill is a pain in the arse too.
So an expat group where membership is vetted? What were the criteria? Just whoever you didn't like the look of? Education level? Salary?
Bit weird to run an expat networking group and not let anyone join

