The exit permit thing means that if you make any mistake, or it appears that you have made a mistake, first thing that will happen is your exit permit being cancelled. From there on, whoever is in charge will open an investigation (a lengthy one, usually) to determine wether you are in the wrong or in the right. In the meantime you are locked in QR regardless of your finance or personal situation.
This is the main reason for having most pilots not coming back from vacation. Not worth the risk resigning, geting your exit permit cancelled for all the notice period and geting locked just because your dog **** on someone else's backyard and the neighbour decided to open a police case on you.