Strange... you didn't reply about it being wrong after I posted it. You know (or apparently, you don't), the best way to know about something is to try it. You got a saved game, right? Alright, just do the quest and see what happens, you'll notice I wasn't "wrong". If you aren't happy with the result, re-load you saved game and you're done. You don't even need to come here to ask for anything, and from now on I sure hope that you're going to use some common sense. Try the damn quest for yourself and see what happens. It's not like you're playing with real fire, it's a game, and saved games are there for something, there's no risks, do it, and see for yourself.
And apparently you haven't done the quest anyway, I am not "wrong" in any way about what I said. If you do help Roy Phillips bring his damn Ghouls assholes in the tower they will live with the human residents for a while, until after a few in-game days after which those residents are gone and only a few Ghouls remain, the "main" ones being Roy and his two "friends", one of which is now a trader. There's nothing "wrong" about it, and it answers your damn question. You like the normal human traders in Tenpenny, so don't help Roy even if you like those stupid Ghouls or else you'll lose the traders eventually. It's that simple, but apparently you are so enraged about God knows what that you completely missed the point and thought I was "wrong" about something.
And, no I do not want gratitude from a person like you, or anyone around here for that matter. I simply tried to help you. I obviously made a mistake about the link in your first post. But instead of bitching about it you could have simply pointed at the mistake and told me to "please read the post again" instead of making yourself look like a moron with your « heaps of geniuses on this forum » sarcastic remark.