​just eat twice as much.

But at least the extra cocoa (expensive ingredient) is replacing the cheap (sugar) ingredient. I agree that it is still low at 50% for a dark chocolate product.

Cos they merged with the 50p store next door

I wondered that as well? The deal is one for £1 and buy another half price so it's still good, just don't remember it being that much before the deal. Also worth noting these are the small 100g ones not the bigger 200g.