Check out this link for LOTS of information:
http://www.cigargroup.com/faq/#4.1
From what I have learned over the years is that many cigars available to us here in the USA aren't really suitable for long term aging. In particular Dominican cigars. That's not to say that a harsh, green (as in fresh rolled) won't benefit from a year in the humidor. Some cigars age well, others don't. As the link above states, a garbage cigar will always be a garbage cigar.
Yes, some cigars benefit from aging. From what I understand it's mainly certain Cubans and some of the more powerhouse Nicaraguan cigars.
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