I wonna know!
You see, it is a common desire for kids who just have started their cognition of this world. They know nothing about it and they want to know everything about it. Adult people know enough about this world and so they feel no need in learning more about it. Though, there is still something they don't know and that something is their future, and that is what they want to find out about.
It is common for people to get into some troubles and when they get extremely frustrated with those troubles all of them say that were they said about it will happen they would do everything in order to avoid it. And that is the main reason for peoples' desire to learn more about their future, to lift up the curtain of time. They are sure that it would be of great help for them.
People are always thirsty about that knowledge they can't get and the knowledge about future is likely to be the most desirable knowledge for people. They can't see it tough they are looking for those who can and they find them. They find those people who are likely to be able to see the future and they ask them about help.
And they always get the help they were looking for. Though, it is rare a truth they hear from such people. In most cases people don't need the truth indeed, they just need someone who can tell them something good about their future in order people were not afraid of it and of event the future will bring them. It is the fear for unknown that make people thirsty for information about their future.