\I'm not saying it hasn't happened, but I can't imagine it's very common. And if it is very common - I am curious what sort of level thirty character one might play, that a) enters pvp that often b) looses pvp that often c) is disliked enough by their enemies that a raise isn't considered?
When I kill someone in pvp I ask them in a Tell "Do you wanna get raised and continue RPing with me or do you want to stay dead and respawn" and if their answer is "can I just get an occ raise and no RP further because uh... I gotta log" then no I don't raise them, regardless of if I know the player or not. If you want a raise after you lost pvp, be prepared to be a slave or tortured for information or other kind of RP where you are RPing the weak. Or just respawn. Or just log.