Considering how much people are willing to pay to criminal gangs in order to enter the EU illegally, I see two possibilities:<p>1. This cash deposit is lower or in the same ballpark, and people will gladly pay it and forfeit it by not leaving.<p>2. It is much higher. This seems very unlikely but would keep the incentive to enter illegally.<p>I think that effective migration control cannot avoid strong and effective enforcement, especially control of borders.