Time & effort

A cynic might argue that many design ideas amount to little more than reinventing the wheel. Someone has already solved the problem you are trying to tackle. All you have to do is to do a data search to find out. Yet there may be no substitute for a lesson learned first-hand, through trial and error. But you have to have the time and the energy to put yourself through whatever it takes to gain all this experience. There's much at stake for an ideator to take an idea to fruition.