The products also have/had a lifetime guarantee - providing you could find a rep and they still made the product… Got a jug replaced after 40 years of hard service.
It’s also why the party model failed them - MLM for a product that never broke or wore out.
Newer tupperware was microwave safe.
Reps got a cut of party sales and if they made enough each month the could get other benefits as well (a company car, for example).
In the UK there is a split between England and Wales and Scotland. “southern” UK trespass is a civil offence. Scotland it is criminal.
So in southern UK trespassers will most definitely not be prosecuted (the railway and power plant property are, iirc, the two exceptions because they have by-laws) but may be sued for damages, in Scotland they can be prosecuted.