Whilst I admire your passion on the issue I think it would be more appropriate to accuse the Trafford centre of being outdated rather than moronic. Until relatively recently one of the many uses of the hard working, and much abused, apostrophe was to signal the plural of abbreviations. This was the case when I was educated and so I used to buy LP's in the 1960's. My then English teacher would certainly have approved the plural of 1000, as the abbreviation of thousand, being written "1000's". However, as Lynne Truss points out;"Only one significant task has been lifted from the apostrophe's workload in recent years: it no longer has to appear in the plural of abbreviations" (2009, p.46).
Being accused of being outdated is, of course, a much lesser insult; if it is an insult at all. I was using the plural abbreviation apostrophe until the current century.
Truss, L. (2009) Eats, Shoots and Leaves, London: Fourth Estate.