Reprisal?

[Buzzatronic]

I think the reason it's a reportable offense to blizzard is because rooftops are used to evade NPC guards who are there to stop PvP in certain areas.

A quick google search pulled up this (old) thread with this interesting quote:

It is additionally important to note that our stance toward rooftop camping in Azeroth has not changed and will remain a punishable offense when verified by a Game Master.

Seems pretty clear to me that attacking anyone from a rooftop in any non-outlands area is a no-no regardless of how much "fun" you have doing it or how long you did it for.

[Eteocles]

Main reason this was implemented was due to horde going apeshit on everyone in Darkshire standing on rooftops where only epic mounts, or base mounts with speed trinkets could get to, avoiding both guards and any, for irony and lack of a better word, 'reprisal' from other players ;p Anyne mounted tries to get up there they'd be dotted/blown up before they stood a chance, thereby removing "Pvp solution" from the equasion; plus it's just plain a dick move You can do better than that

This isn't just ALliance only though; there are new, stealthed w/ stealth-detection lv70 Troll Archer guards over EVERY GODDAMN ROOFTOP in the main area of Orgrimmar now who do like 2k per shot; stealthing into the lot of those was not fun. So even in a supposedly safe area like Orgrimmar blizz makes it's roof policy obvious ;p

[Los]

not really, the darkshire crap still remains like always. But i dont mind, ill report every one of them.