Another reason is that once you overstay, you're usually breaking the law of the country. This means if for any reasons law enforcement stops you, and checks your paperwork (or you're a victim of a crime and go to the police), they may detain you, and eventually deport you. Whether this would really happen depends on the country and the area, but those things are volatile. Thus even if the country historically was lax toward overstayers, an act of terrorism, unrest in neighbor country or regime change may change this overnight.
George Y.
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