The policy must rebuild, not resell
Where market values are low, the instinct is to insure for roughly what the house is worth. That instinct produces a limit that cannot rebuild it. Labor, materials, debris removal and current code requirements set reconstruction cost, and none of them track the local resale market.
Crossing the line for ordinary errands
A US auto policy generally provides no liability cover in Mexico, which requires insurance from an admitted Mexican carrier. In a city where crossing is routine, that is a daily exposure rather than a holiday one.
Older housing and what a claim finds
Wiring, plumbing and roofing in older stock are where claims begin, and several of those are excluded when the failure is gradual rather than sudden. Knowing the age of each system is worth more than shaving the premium.