See - I put stuff in my basket - then keep shopping around, because I need this one thing - but I don't know if I am bothered to receive the item during the week rather than the weekend, or for a million other lazy-me reasons - also I convince myself I get a better deal somewhere else?.. that's why my e-commerce baskets look like abandoned - and then I get hit with discounts and reminders, sometimes you can profit by waiting a day instead of impulse buying things - unless you're running out of toilet-paper or food that is :)
The amount of profit some companies throw away because of some half-assed split-testing experiment is unbelievable.