I did have an inside-my-head “how much??” rant when I bought a book of First Class stamps the other month; but then I remembered last year, when I thought it would be pleasant to deliver my brother’s birthday card in person rather than mail it; and in comparison, I’d much rather pay £1.65 for Royal Mail to do it than have to cycle from SE23 to SW4 ever again, or take the P4 bus there and back (which I believe costs £2 each way nowadays.)
I suppose that’s just the way we have to think of it: now that the vast majority of life admin is paperless, the only things we really have to pay for are the greetings and celebrations cards, and £1.65 is really something of a bargain for that compared with the alternatives.