[calt]

IMHO it's to add clarity. The white space gives extra separation to statements.

It's how I write most of my communication, like statements are lines of code.

[bastawhiz]

It definitely doesn't add clarity for me. Paragraphs group sentences about an idea. Breaking sentences into paragraphs implies that you're starting a new thought. If you're not, it just makes the writing choppy, and it reads with extra pauses in my inner monologue that I think most people wouldn't have if they were speaking rather than writing.

[xboxnolifes]

I also hate when people wrote code with a blank line between every line.