Well if at peak times there are only 60+ players playing MWLL what's the odds that even 10 are european time zone? Not much I'd say. Maybe we need to take stock of how many euros there are out there (or those who play on european times)?
I think there are more than you realize, but I think one of the issues is they are not coordinated, on teamspeak 3 or in units. I've been on at these times and the majority are pubs. Its difficult even in the US timezones getting people the community teamspeak 3 info, but I spam it all the time in the servers to try and get the information out there. I think if someone actively pushed the message, and gave a try to organize a few things you would be set.
As previously said, Open Merc Night, is just fun pickup matches with c-bill limit, no respawn. Requires a server admin, which being one, and being on allot and when the majority are on I can just make a post, or hop down to where the guys are in the teamspeak and spread the word quickly. Allot of guys leave public matches just to play these type of matches, they are a blast and so much fun.