I'm sure there are a number of reasons--properly calibrating humidity, taking the edge off younger tobacco, etc.--but in my experience, certain cigars benefit tremendously from a few months or more of humidor time before smoking. At one level, it doesn't seem to make sense for well aged cigars to benefit, but I've become a believer in aging. Many don't benefit ostensibly, but others can change dramatically in their taste profile, burn, and the overall enjoyment they provide (I've had a few that I didn't even recognize as the same cigar after several months). Aging can also make a really good cigar even better--e.g. I've had some Oliva O maduros resting for over a year, and they have gone from great to one of the best cigars I've ever smoked.
Just my 2 cents, but smoke some now and make sure to save a few for later. You might be very pleased with the results.