I bump hip-hop from the 80s & 90s
all the time.. I was rockin "The Questions" Common feat Mos Def this week! Hell, I was rockin "Raising Hell" by the Gods of Hip-Hop Run DMC this morning driving into work!!
Mofos have no clue what half the music is -

II, you right about Camp Lo. You can still bump "Luchini", "Cooley High", & "Black Nostaljack" . Too me, Camp Lo was one of the most polished groups in Hip-hop history. Totally unique just like Das Efx, Boot Camp, Heiroglyphics, etc.
A lot of folx started listening to hip-hop once it really started becoming commercialized in the late 80s early 90s tho.
I was listening to the 2 Live Stews yesterday & they were talking about the top 5 groups of all time in Hip-Hop.
They're list was
1> Run-DMC
2> NWA
3> Outkast
4> 8-Ball & MJG
5> A Tribe Called Quest
Ahh... they were close... Personally, I wouldn't put Outkast in the top 5 because they didn't seem to have the impact other groups did IMHO. They also had them there cause they claimed Outkast put the south on the map.
UH WHAT? Have they ever heard of The Geto Boys & UGK??
My top 5..
1> Run DMC - The trailblazers who opened the door for everyone in the game
2> NWA - Changed the game. It hasn't been the same since "Str8 outta Compton!"
3> Public Enemy - The pinnacle of conscious hip-hop
4> A Tribe Called Quest - Low End Theory & Midnight Marauders. nuth'n else has 2 b said
5> Wu-Tang Clan - greatest collection of MCs in one group eva.
Honorable Mentions:
Outkast, BDP, Eric B. & Rakim, The Roots, Gangstarr, EPMD, etc....