Sometimes, they come back.
This didn't make it into In the news, good bad and ugly because there were no defensive firearms involved, and the homeowner was a petty criminal as well (marijuana).
But to me, it proves one thing... If there is little or no resistance to the BG's on entry to your home, and you have something they want... cash and/or other goodies the first time... they just might come back with more friends. Just to see if you've restocked, replaced, renewed, whatever...
So, make it hard and painful to enter your home in the first place... discourages 'em, you see.