Good afternoon!

The picture shows 2 items listed in the Crafts category, both 18g (under 100g with packaging), and both listed for £2.25. Both are just a folded piece of paper with instructions on it.

The one on the left is a knitting pattern, and quite rightly, I have the opportunity to opt out of SD and list it with £1.55 postage - all that is needed for me to send it with a stamp.
However, the one on the right is a pattern chart for a rug design - there is no option to opt out in this sub category, so I had to list with SD and  £2.70 postage (making it unlikely to sell). 

They are both in the same main category, so why no option to opt out? I would imagine that a paper pattern/instructions, would be an option in EVERY sub category in the Crafts category, so there really should be an opt out in each sub category.