Besides that it would be fun, of course, I can't really see the point of growing bean plants that are too tall for you to pick the beans from. Unless . . you live in a tall building and want to share your harvest with all the apartments above you, I guess. Nobody would get enough for a meal, though, I fear.
When you plant beans in a garden to produce food, you put stakes in the ground about as tall as you can reasonably reach, and when the beans climb to the tops of those stakes, they droop over and hang down where you can reach them again. Sometimes it even works to pinch off the growing tip of the stalk, and it will branch and be even more productive. But the idea of having to use a ladder to harvest my beans seems impractical and dangerous. (ladders being rather unsteady on soft ground).
