Increasing the white space between products on your site also increases customer favorability of your products and almost doubled sales in the study.

The space allows for easier identification and mental processing by shoppers.

As Nate Bargatze says:

Every book is just the most words. It doesn’t let up. Every page is more words. It’s like ‘what are you talking about?” Put some blank pages in there. Let me get my head above water for 2 seconds.