Yeah exactly, and this seems to be the reason that android doesn't allow apks to be sent over Bluetooth, so we haven't really found a solution so far unless you count swapping SD cards.
It doesn't allow you to easily get at apks you've downloaded from the Play store, if that's what you mean, but I think that's just an anti-piracy measure. An apk you've downloaded from somewhere else is, as far as I can tell, just another file. I can't imagine why (or how!) it'd stop you from exchanging them, particularly if you have some sort of custom Bluetooth client.
Does it really try to stop you?