No, no, no, you got it all wrong! :-) LXen is just the third-person plural for LX.
When referring to particular LX items you say, "I have one LX with my name engraved on the lens." or, "I have two LXs with snake skin shutter curtains." or even, "Those gold-plated LXs on his table are under-priced at $10,000 each." But when referring to the population of LX cameras, you use the third-person plural, as in, "Yes, LXen are well respected cameras, except for their low-light metering characteristics." It's just that simple! (tm) :-) - THaller