Yeah, imagine watching the game from the comfort of your hard-earned stadium seats, which you probably paid an exorbitant amount for, only for the actual stands to collapse above you, and for a stream of water to pour right on your head, effectively drowning you. If there ever were a worst-case scenario, that would have to be it. All the more reason to make sure stadiums are built as they should be.
There just shouldn't be any corner cutting when it comes to building these massive constructions supposed to house thousands of people. No expenses should be spared. If you want to be frugal, you shouldn't build a stadium.