Do I buy them?

I want to buy a pair of black jeans. My current black jeans/trousers/trousery jeans are baggy around the bum. Partly because they are old and partly because my arse is flat as a pancake.

BUT I recently discovered my perfect brand of jeans which actually aren't saggy! They fit perfectly! But are expensive about £80.

ASOS has a pair in black for £60. Technically I don't need black jeans because the ones I have are wearable. But I want them. Because my arse so rarely looks good and I have faith these will do it!