I did sort of a hypothesis on another thread.
The motivation of the BEKs is very simple: access. They do not want your money, or to trash your house, or anything like that. Their single minded
goal is access to your home, car, business, i.e., your personal space. Your life. It seems by granting them access to your physical space, it could be
sort of a symbolic granting of access to your spiritual/astral/psychic/whatever space.
Its like tales of contracts with the devil or with demons. It seems the devil or demon or whatever evil entity requires your permission before it can
enter your personal space, and thus, wreak havoc on you or suck out your soul.
There are varying theories as to why this is. Thos of a Christian persuiassion believe that God prohibits evil entities from simply jumping into
people and poassessing them or harming them without the individual making a declaration of desire to align themselves with the demonic influences.
Others of a more new age bent believe that your soul is a very strong natural barrier to negative entities or energies, and thus, evil cant simply
move in, it requires you to lower the drawbridge so to speak and "let it in". In the Pagan world, most believe its a matter of balance, and thus, by
natural law, negative entities or spirits cannot extend their influence without a concious act to allow them outside their sphere.
Its clear that its all about symbolic access. In many cases of BEKs were not physically restrained from entering their victim's home or space. In
some cases, the door was either opened or unlocked, and physically, they could have walked right on in. But for some reason, they failed to do so
because the person did not give them permission to come in, and thus, some sort of psychological or spiritual barrier was in place to prevent them
Here is the other thread which I layed out my own outlines of studying this curious phenomenon.
As for Nygdan's belief that its made up, I disagree. I believe the persons who have reported these experiences are speaking truthfully as they see
it, and at the very least, genuinely BELIEVE something strange and profound happened to them.
Now what exactly happened to them is another matter up for debate, which could range from some kids with freaky contacts running an amusing scam on
unususpecting people to an actualy paranormal and malevolent type of phenomenon.
I am doing my own research and searching the net for perhaps earlier accounts of such activity in earlier folklore or historical accounts to see if we
have paralells with older phenomenon or if this is indeed something new.