adias:
You may suspect as you wish, and in some senses of the thing you are perfectly right - there are always reasons why people do as they do. But, size is certainly not always a matter of finance. Size is also a matter of personal fancy, space available, money thought worth spending, and don't forget that for many, photography is not the all-demanding obsession that it is for some others.
Regarding camera weight: you're right again, insofar as I am concerned on a personal level. I am old, did in youthful days carry a couple of 500 Series Hasselblads, three lenses, backs and a yellow Kodak freezer bag full of film. I did that because I was getting paid for what I was photographing. On other jobs it was exactly the same except it was perhaps four Nikons and at least seven lenses and the film bag. In both cases, throw in a useful tripod. I never employed an assistant. I was healthy and fairly strong if thinnish. Today I am still thinnish (look! no beer gut!) but far from strong. And as importantly, whatever I do with a camera now is entirely for my own satisfaction and occasional amusement. I have given up printing for reasons HP should be ashamed of, and whatever looks fine on my website is alI I require from files.
And no, I would not print larger unless I suddenly discovered a busy commercial market for my prints.
As for the thread 'deteriorating', as you put it, don't forget that this is a social resource, not a strict educational institution; there's room for both aspects - as it has long shown - and also bear in mind that what can usefully be said on some topics is often said quite quickly, leading to a dead thread...
Rob C