Why does peanut butter always come in plastic and vegemite always come in glass?

vegemite jars need to be higher quality because it takes far longer for a Jar of vegemite to be finished. a large jar of vegemite may take years to finish Not in my place Maybe it's a sinister tactic aswell to force people to buy vegemite more regularly cuz when u drop a vegemite jar that's usually the end of that