Not so sure. People are generally stupid. I have sold equipment and not allowed someone to leave without securing it properly, giving them or selling them straps.
The not allowed part is what could cause some concern. I have seen this play out really bad a couple times! Myself having had concerns in the past I strongly recommended they not do something, and use more straps or suggest a better method. I have even driven one guy to a local store to buy real straps but I strongly suggest loosing the word ALLOW as with some people you may find yourself in a real bad position if trying to assert authority you don稚 have over thier actions.