Sounds like a very logical argument to me, so I can't fault you for it.
As for the cards, they certainly do seem like a bit of a waste of materials to me most of the time, however there has been the odd few times I have (and might still) buy one for a friend or two because of spotting one that I think would like and wanting to see their reaction to it, but again it's rare.
I completely understand and agree with that exception too.
Completely understandable, with the Boxing Day and January sales immediately following Christmas being a clear example of the commercial exploitation as it implies that people who bought things before Christmas for the event paid more than they really needed to if they had waited.
Whether it was indeed more expensive in the run up would vary of course given the amount of sales around at various times in general these days, with a bit of research required on a case-by-case basis, as it would for the sales after Christmas too.
I can completely understand that.
Junk mail is obviously a scatter-gun approach anyway, but it certainly makes me more adversarial in my thinking towards the companies in question using it, and thus more likely to avoid them for that reason - assuming that I have any want/need for what they are even advertising in the first place, which isn't usually the case.
I'd be even more adversarial of course if it is specifically to my name rather than being the default 'The Occupier/Householder' type of course, but that doesn't mean I'm a fan of the latter either.
The only exception to this that I am happy with would be the menus popped through the letterbox by local takeaways, although I would of course still make sure to check their Food Hygiene rating before choosing to use them.
There have only been a few times that I have bothered to contact companies to get them to stop junk mail however, I believe the last time they were the sub-prime credit card offer type, that were sending them like clockwork, and they were addressed to me specifically if I recall correctly.
I realise that there is of course the Mailing Preference Service, but junk mail is usually the 'Occupier/Householder' type and thus wouldn't be covered anyway.
I can't fault you there either, especially since after Easter retailers are suddenly eager to sell you their remaining stock of Easter chocolate at a steep discount compared to what they were charging before (like a pack of - or singular - Cadbury Creme Eggs being sold off at something like a tenth of what they were charging before for example if I recall correctly).
I eat much less chocolate as an adult anyway, with it being the occasional thing I might fancy rather than a regular thing. And when I do buy it however, it's more likely to be a store brand as well, with it usually tasting no different to me than the branded ones.
Such as the packs of Asda Caramel Biscuits being their version of Twix and Asda Caramel Chews being their version of Mars Bars - albeit being closer to the 'fun-size' type rather than the full size ones.
I certainly don't think I'd be able to repeat my feat of eating a (if I recall the size correctly) 5Kg Cadbury's Dairy Milk within one week.