Japanese SFX from the manga are just a figure of art so we doesn't really care if it's there. But when a scanlation site, less than half of them even try to edit the SFX of the manga, simply because they think it's hard, well it is >.< XD I am an editor and editing one SFX is the same as editing a whole 10 pages of manga! Also, talk about SFX on top of the HAIR
And have you guys notice that only Viz media edit the sfx? not even tokyopop edit it! So we have serious issue here, it's not something regular, it's not a regular basis. A manga with just a SFX of (SFX = equals translations whatever) is acceptable, because we the manga lovers doesn't care about SFX. Plus! Japanese SFX looks like a figure of something XD Then what about those people out there who spends hours to clone the SFX and edit it? 
Personally, I think SFX aren't even one percent important, we don't really need a text to say that this girl is blushing or whatever, we can see it from her face! and plus, with the expression!
For the artist and the japanese editor it is easy to edit the SFX since they did it first of all, for us fans editors for fans can't do it over again, because we are trying to draw over something that had already been drawn! >o<
