As said above you need to budget, and have some working capitol before you roll out.
Cost will depend on how many people you can put in a room, and how you want to eat. Murphy likes getting a suite so they can cook in, conversely I like cheap diners so I don't have to put the time into cooking.
For myself, I figure around $100-140 per day just to live on the road. The hotel cost is the biggest part, if there is a Waffle House near by i can get away with around ~$20 a day for food. Fuel getting there is a big kicker too.
Getting into a storm well after the initial event is problematic, for the best money you need to get in there withing days of the roads opening. make deals on your first few jobs and word of mouth gets the ball rolling. If you are a few weeks out from the event, then hooking up with a local is a good way to go, you will mostly be chasing hangers by this time. Most of the urgency premium is taken up.
Demographics is a big problem fro the carpetbagging tree company. You need some local help telling you where to go to get started. The offering them a referral fee, or equal donation to their church or school....
If you are running a crew of any size, you need a sales puke/coordinator. Backlogging 2-3 days is good, but longer then that is unreliable.
There is more urgency in getting stuff off roofs; contract for hazard mitigation and a return to finish less hazardous work at a later date.
Higher end customers are often willing to pay for chipping, and it is easier on the crew then staking 10 ft high. I've chipped brush and stacked logs on some jobs, though often it is not worth dragging a chipper all the way in on huge storms.
Which brings me to the supply/demand curve of storm work. Small storms it is not worth the time to travel to. It needs to encompass several counties. A good indicator is how many people are without utility service.