It is human nature to want to find the best deal possible.  When making significant purchases, as is typical when doing a significant amount of traveling, it is wired within most of us to want to search out the best deal possible.  After all, the more that we can save the more we are able to travel.  Most of us are also extremely trusting when we travel.  You have to put yourself out there and put your trust in other people to a certain extent when you travel someplace you are unfamiliar with.  For this reason, most of us like to think the best of the people we meet and interact with when we travel.