Why do people that are Into rap and hip-hop even want a high-end audio system

It's a form of white privilege to assert that in a racially biased society, the USA, that something is not about race.  You are using your whiteness to deny non-whites the legitimacy of their experiences.  The issue of race has been one of the defining issues in US history since the early 16th century.  To deny this is to be the equivalent of a Holocaust denier.  Whether it was minstrel shows, blues, jazz or R&B it was generically referred to as "race music" which was only taken seriously after it was appropriated and crossed-over by white performers.  So when someone claims that rap/hip-hop is not even music, whether they intended it or not,  they are continuing a century old tradition of marginalizing black performers which can legitimately be seen as a form of racial bias.  Sometimes the phrase "it's not about race" is the real inflammatory statement.

Tostadosunidos, I am not accusing you of racial bias.  I am simply pointing out that the line of argument you take is similar to that taken historically by racially bias people.  Black music was always referred to as simple and primitive.  People called Duke Ellington "jungle music".  Bebop was a bunch of junkies blowing noise.  And let's not forget that young white males and especially females had to be protected from sexual rhythms of Chuck Berry and Little Richard.  There's a real history in this country of bashing black music by people intent upon keeping blacks in their place.  Are you one of those people?  I doubt it.  But I would argue that practically everyone raised in a racially biased society will bear elements of that bias.