Join Date: Dec 2010
Location: southern Arizona
Given how US law works, they could be afraid of being sued if someone gets hurt. Jumping is statistically significantly more dangerous than not jumping, and a lot of lawyers would salivate at the thought of suing the business for allowing you to take the risk. In many states, you cannot 'assume the risk', even as an adult. If you are a minor...forget it!
A business can be held liable for your doing something even if they banned it, on the theory that they should have expected you to ignore the ban. I honestly do not know how any business stays open with the legal vultures flying around. In any case, it is up to a business and their insurers to decide how much liability they are willing to chance. You may disagree, but they are the ones who risk losing everything they own.
"Make the right thing easy and the wrong thing...well, ignore it mostly."