You have a legitimate idea here...but personally, I can't imagine anything the Rhodens had that was worth millions somebody over. Unless the killers were lead to believe that there were 10's of thousands of dollars hidden in one of the homes. Didn't find anything in one home, move on to the next. Rumors about hidden money would certainly motivate somebody to rob the place, but that could have been done when nobody was home, and it isn't likely family members could be a 100% sure that "Lee" is the ONLY person who could have robbed us. No different than being robbed in town as in the country. Unemployment as high as it is there, each family member could have named two or more people who"might" have broken in and robbed them.