I was recently playing around with the Website Grader at websitegrader.com and read this:
Google and other search engines may penalize websites with domains that are set to expire soon. The reason for this is that many spam sites are often registered for short periods of time. Most registrars support paying upfront for several years and the cost is usually only about $10-$20 per year, so it is generally worth it.
I have heard this before but dismissed it after reading this comment from a Google employee:
A bunch of TLDs do not publish expiration dates -- how could we compare domains with expiration dates to domains without that information? It seems that would be pretty hard, and likely not worth the trouble. Even when we do have that data, what would it tell us when comparing sites that are otherwise equivalent? A year (the minimum duration, as far as I know) is pretty long in internet-time :-).
Does anyone have anymore insight on this? Could registering my domain for 10 years significantly improve my site's authority?