Some people are content with a lawn chair, cold beer and a rod in a sand spike, waiting for a fish to swim along.
Some feel the need to hunt them down. That is the personality that brings the need to continue to push the personal envelope. As you try new things, learn new techniques, and find success, you also gain confidence. You wade a little deeper because you now know that the piece of water a little further out than you can cast will hold fish. You learn to get your feet planted on the rock that is gettin covered in wash. You also over come your fears and understand the risk is calculated. You eventually find yourself in a wetsuit. The last step for a surfcaster, is getting rid of the korkers and replacing them with fins.
Natural progression.
Whatever makes the experiance more exciting, and increases your success.
God is Great, Beer is Good, People are crazy.