I do quite a bit of online shopping. One thing that many sites have implemented, is an attempt to recapture your attention when you've added items to a shopping cart, and then abandoned the cart.
This is seen as a feature in many implementations of carts for online stores.
Given it's so common now, I've also found that many can be manipulated. For example, one clothing store that I like, will send me a reminder about my abandoned cart one day later. Often at that point, they'll make an additional offer, like free shipping.
But that's so predictable that every time I shop there, I put items in the cart, abandon them, and wait to see what deal is offered.
First lesson: Don't be predictable on this.
Now I'm sure that some purchasers are hesitant, and a simple reminder will get them to purchase.
But what many sites don't seem to "get" though, is that I will often have abandoned the cart for a reason. Something wasn't clear or something wasn't quite what I wanted.
I've noticed that none of the sites ever ask me why I've abandoned the cart. There is an enormous amount of value that they could learn if they just asked that question.
Instead, they annoy me, by continuing to send me reminders about my abandoned cart, without ever addressing my concern or hesitation.
Second lesson: Don't just pester people about abandoned carts. Ask they why or how you can help. You might be surprised by what you learn.