I'm intrigued.... So, it's not okay for temp use and not for permenant use.... So, what is the purpose of this slinky-like plastic matter that is for sale in every hardware store in the country?

Or, am I mis-understanding the sarcasm here?

Don't get me wrong, I know these things are junk and have no place in a house.... but they are sold for a purpose. I guess my question is, what is the purpose?