I dug through a few sales records for domains that end in LLC, there were only a few examples:
OneLLC.com - $260
VirtusLLC.com - $750
NRTLLC.com - $3,000
NCSLLC.com - $248
So... they do sell - but it looks like just dumb luck end-user sales. No major keywords besides "one". Iwould probably stay away.
Justin