Getting the best quality / fullest itinerary at the lowest price is usually how people decide that they received the best shopping experience. However, if the lowest price is all that interests you, it may not be the wisest factor since cheaper does not always mean the best experience. How then do you decide if the trip is a good value?
Time and time again I hear "I want to save more money" then the person does, goes on the trip, comes back and tells me "I should have listened to you, XYZ really was the worst part of the trip and what you had recommended would have been better". This is where value vs. money savings comes into play. Usually when people say they want the cheapest price, they mean the best value. For example if you have two hotel rooms at the same hotel but one is $50 / night and the other is $60 but includes breakfast and a free upgrade to a suite, which would you prefer? If you said the $60 one then you look at value not just price.