How can it be that anyone in the world falls for this anymore? My daughter recognized this obvious pattern when she was 7 years old: "It's $5, dad, why don't they just say $5?" I wonder if pricing something at $4.99 have anything more than a vague subliminal effect these days?
Part of it is that people want to be tricked. If I want to buy something but I'm on the fence about whether it's worth $5 then I think the $4.99 price works as like a semi-subconscious plausible deniability mechanism to let me allow myself to buy it.
Imagine two apps you’re scrolling by in the App Store. One is $5, the other is $4.99. Barely going attention (essentially picking subconsciously rather than consciously), you choose one to click first. What are the odds you clicked the $4.99 one?