yeh, Its all good saying what rap shoulsd be. But the reality of it, rap music in the mainstreams ears is made to sell.

Whats selling these days?! Guns,money, chains, hoes, living tough, being street and all that.

Now, someone whos living with his wife and kids and living happy, eating well and all that, is no longer street or can even portray that lifestyle in a fake feeble attempt to sale records.
Rap music is purchased by younger weak minded kids, so the Majors want people that look up to in a "big brother" sense, not a old man, or grandad point of view.
Basically it boils down to the fact, old men raping flapping there gums isnt what the mainstream want, so they arent gonan make music to sell.
Theres no doubt alot will make music for themself, but the labels want what sells.