There is nothing very complicated about how bindings work (http://www.epicski.com/t/119829/help-dynastar-omeglass-px-bindings-installation/30). Creating and retaining constant and consistent pressure while all parts being stationary is the name of the game here. As such, wear and tear in bindings will most likely come from creating and retaining pressure rather than infrequent movement of parts by nature.
The source of pressure, of course, is the spring, and the receiver is various internal/external parts such as spring casing, washers, binding shell, hinges, connecting rods, bolts, etc. I think it's a plausible statement that the useful life of "receiver" parts can be maximized by minimizing the amount of time for which they are exposed to pressure. On the other hand, the behavior of springs seems to be the hotly debated subject here. Do springs retain their resilience/torque better and longer with (1) consistent load at all times, (2) minimum exposure to load (i.e., crank down DIN off-season), or (3) constant fluctuation in load?
I think (3) can be safely ruled out here. The evidence is the bindings on rental skis. DIN readings on rental ski bindings are usually higher than their true DIN, due to metal fatigue caused by repeated DIN adjustments for customers... Unfortunately at this time, I don't have an answer on weather (1) or (2) is true, but there's got to be some study done on this available on the web.
With all that said, I store mine with minimum DIN load possible, and it's a personal choice. Unless I find some empirical evidence otherwise, my own speculation is that (a) springs will get weaker over time with constant load, and (b) very infrequent once or twice a year off-seasonal adjustments cause little to no fatigue to the metal molecular structure.
Edited by nochaser - 6/23/13 at 3:13pm