I think in some cases it is because people are taught that Comma Splicing Is Bad. But imo Ellipse Splicing Is Worse (and should probably be Considered Harmful ;) ). Commas or Em Dashes[0] are better, clearer, and (AFAIK) more grammatically correct.<p>[0]: <a href="http:&#x2F;&#x2F;www.thepunctuationguide.com&#x2F;em-dash.html" rel="nofollow">http:&#x2F;&#x2F;www.thepunctuationguide.com&#x2F;em-dash.html</a>