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I like going at my own pace. And I don't like waiting around for others, and likewise, don't like when others have to wait for me. I don't want to be standing around at camp for 45 minutes while the others repack their entire bags or figure out how to take their tent down.
Plus it just allows me a degree of freedom that doesn't exist going /out/ with others. I only need to take care of myself and rely on my own experience and skills. Plus the quiet is nice.