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

I think it's a different concept of high-end with a definite boost of the extreme frequencies.  Look at the Beats headphones which were popular but which no traditional audiophile would want any part of.  But mine is an outsider's view, so take it with a grain of salt.

Lots of bass is definitely an attribute. Audiophiles like bass as well right, as long as there is some quality to go with quantity? Rap/Hip hop recordings are fertile grounds for that and sometimes other unique audio treats as well resulting from sampling and mixing other recordings into the new one. It can be rewarding sonically but still hit or miss like most things. Depends what floats your boat.

You need a good system though that can go loud without distorting, clipping, compressing, etc. to get best results. Sound familiar? Producing lots of quality bass is hard work. Underpowered, undersized systems will be challenged.  I suspect if they can do the job well with a variety of rap/hip hop, there is a good chance that it will not break a sweat with most of the rest ever.   That's almost always a good thing.

I feel my system is much better overall for using rap/hip hop music to help evaluate it as well as all the more traditional stuff that people have used for this purpose over the years.

I'll say one thing for you Taters, you know how to rankle the mob. Agent provocateur!

How is tater's question veiled racism?   It's a valid question he's asking about whether accuracy is important to music that generally uses computer generated, often bloated sonics, low quality samples, high compression and is optimized for a club environment.   I know Rick Rubin has an audiophile system and cares about sound quality, and I'm sure Russell Simmons and jz have elaborate systems as well.   

Let's see its his second thread devoted to why rap is either not music or not worth listening too in just a few days plus he brought up the exact same subject in a totally unrelated thread. Now I didn't call it veiled racism, I said "its beginning to smack of veiled racism" and quite frankly given the relentless trashing of music that is largely produced by and listened to African Americans, it does make you wonder. Or at least it does me sorry if that offends anyone or if my reply was to strongly worded. I wish there could be more tolerance in the world of music and of people.