The 911 is designed and manufactured to higher standards and specifications, hence, the ~70% higher price premium.
Compared to the 911, the Boxster is a niche car and it fills that niche quite wonderfully.
The broader market appeal and perseverance of the 911 compared to its siblings, despite a hefty price premium in most cases, has been time-tested for nearly 4 decades. This level of dominance wouldn't have lasted for so long, had it been based on perception rather than real substance.
As far as what exactly makes the 911 one of the predominant automotive icons of our time, many Porsche specific books are available from some the most respected sources.
All and all, just my 2 cents worth.
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