Are .coms worth more? Yes
Do they necessarily rank better thanks to Google favoring them? I have yet to see any proof offered in this thread.
It's an easy enough hypothesis to test if some wants to bother doing it.
1) Buy obscure domain name in multiple extensions.
2) Create gibberish content.
3) Make Google aware of the site through webmaster tools (NO outside links as this could bias the results).
4) See what ranks highest (not just on day 1 but over time).



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