It's not a matter of irony, it's about that even more characteristic of English humour, silliness.

Silly lists can be great fun - as in BBC Radio shows such as "I'm Sorry I haven't a Clue", and the "worse" the puns the better, for those who appreciate this style of humour.

But a list is best appreciated when it is presented as a list - in one place, not spread out all over the shop.