I think when there are people struggling for next week's food, it can seem a little insensitive to be talking about luxuries with a specific, high value price. But it is even more not the done thing to post a thread about a thread
is that the 3K for shelves thread...not looked at it myself...because I owuld have to say Yabu and was sure I was not the only one, lol
as for price in thread heading/money mentioned in the headings... personally I think it depends on the thread....people get pissed off when people have headings like " oh, poor woe me, can't afford a gardener, because we only earn 100K"...but in a thread like the headline I mentioend up there, I think it wouldn' be a problem!
It surely doesn't take a huge imagination to understand that asking AIBU to spend £3000 on bookshelves is insensitive to say the very least to the many Mumsnetters who live on very low wages or benefits, or who are facing redundancy or have just been made redundant.
Unless you are deliberately being provocative - usually obvious by the wording - then there is nothing wrong with mentioning money in this sort of context. Your quesstion was specifically about the cost of something, you weren't just chucking the money side of it in as a bit of smuggery.
If someone feels put out because they are going through financial hardship then I'm afraid they are responsible for their own reactions, no one else.