As somebody who has been a contractor for 30 years dealing with these situations, I can tell you it is much more costly to provide services to people in these kinds of catastrophe situations.
It takes longer to get from place to place. I have great difficulty getting supplies and materials and they cost me more. I may have to pay more to get labor. The "friction" of business increases exponentially.
So either I need to charge more for a similar service or I can't afford to provide the services they desperately need.
Your case is slightly different. It's quite easy to explain to reasonable customers the difficulties you face supply, resupply, labor, transportation, permits, etc.
I was a residential remodeller during HUGO when I lived in Northern VA. I rented a Ryder, filled it full of framing lumber and plywood, loaded my crew, and headed to N.C. While I got a premium for what we did, we didn't gouge and got very, very few complaints from homeowners.
It's different when you're sitting on ten cases of water at $1.09 a gallon Monday and the same ten cases are worth $10.09 a gallon on Tuesday and you did nothing, or paid nothing, extra to obtain it.