... if prices don't go up, what's the incentive for gasoline delivery companies to make the extra effort to bring resources to a disaster-torn city?
Many comments in here seem to look at this problem so coldly and rationally. Anti-gouging has a deep moral component. If some of us are not trying to get one over on others of us then you can maintain a stronger community during a crisis.
If Bob's gas starts charging $15 for a gallon of gas in a crisis it will cause friction in the community between those who can afford vs. those you cannot and with the employees and owner of the gauging station.
We have also, well enough of us that laws were passed, decided as a society that its just immoral/unacceptable behavior.
Capitalism is great. It doesn't need to deal with this corner condition well to be a successful system.