I believe base raping is sitting outside of the base and firing in with tanks and artillery, I use this a lot, usually when you have most of the flags (if not all), I believe base camping is sitting inside of the base shooting people as they spawn.
I think base raping, while cheap, is very effective and a valid tactic.
Base camping, however, is totally gay.
well base raping I think is when one team is just getting worked (ie: raped). It's not realy rapeing if theres one guy sittig outside with a waspe shooting inside (if there's a whole team, then its rape). If its just one guy, then thats the game.