I believe that, unlike all the closed publications listed, the Beano is still in the black, despite falling sales.
There are a lot of reasons for the price hikes since I started reading the Beano when it was about 5p or 6p in the late 70s. The change from 20 pages of b&w/spot colour/four pages full colour on newsprint to 36 pages of high quality paper in full colour (litho?) is by far the biggest; falling sales is inevitably another.
The price also compares favourably to children's magazines in supermarkets and WHS etc, with arguably more actual content between the advertising. The one competitor which is a traditional style comic aimed at children younger than 2000AD's audience is the Phoenix, a weekly comic which started in January and is available in Waitrose, Forbidden Planet, and other comic shops and is £2.99 for 32 pages.