lucy24 - 1:37 am on Jul 24, 2013 (gmt 0)
Uh-oh, wait, are we talking about initial visits (SEO) or overall long-term traffic including multiple pages, bookmarks and recommendations to other humans? A robot doesn't have eyeballs, though it can certainly read CSS. Unless you've expressly forbidden it to do so.
Postulate: Humans will spend more time on a site if its text content is comfortable to read.
The above seems intuitively obvious-- but things that seem intuitively obvious aren't always so. :( Has anyone got hard evidence?