Well - I hope it was clear enough that my statements were making a difference between makers and sellers.
As for the makers, I cannot think for an acceptable reason: these canes were put in to deceive people.
As for the sellers - I said that most seem to be aware of the fact the weights are made much later, as you rarely find it stated the weight was made in ... whatever the year is. Whenever I notice such a statement, I contact the seller - the majority are surprised, but accept advice, few become rude - and I surely believe these sellers know the truth and also want to deceive ... fortunately they seem to be a minority.
I had not made any comment about the buyers, and I certainly will not imply they wanted to deceive
! I guess there will mainly be two types: either they belong to the group who are learning by making a mistake (we all have done that in the past, and still may be doing it again in future!) - or they knew what they are buying, but liked it anyway. There is nothing wrong with this - I myself own such a "1843" Murano perfume bottle: I liked it, felt I would like to have an example in my collection - and paid what I felt was a reasonable price for it.