[quote=Asuras]
So how is it decided how much EXP is gained for including a flaw during character creation? Also how it will influence rolls.
[/quote]

Different flaws do different things, and not all of them have negatives to Rolls. There are things like phobias, addictions, obsessions, oaths, or other such things. There are both physical flaws and mental flaws as well, and even background flaws (some may give penalties, others have other detrimental affects.