Actually, the psychology of it is more than just extinction. You have an overload of information to process in the first jumps, which occupies your executive functions to the degree that the fear doesn't have timeshare. Then after you get used to the tasks, you now have time to process other things (fear). Furthermore, you are aware that there are but so many good jumps in a row you can have, and eventually you have to have a malfunction. Prospect Theory shows us that humans tend to over-estimate the rare event, especially after a number of successes that drive the Gambler's Fallacy (a bad one must be coming).