According to the Manual of The Planes the Far Realm (312) has the planar trait wild magic:
Any spell or spell-like ability used on a wild magic plane has a chance to go awry. The caster must make a level check (DC 15 + the level of the spell or effect) for the magic to function normally. For spell-like abilities, use the level or HD of the creature employing the ability for the caster level check and the level of the spell-like ability to set the DC for the caster level check.
Failure on this check means that something strange happens…. (Dungeon Master's Guide 149)
A failure on this caster level check sees a spell or spell-like ability fail or worse about 2/3 of the time and be cast normally or a little better or a little worse about 1/3 of the time.
Natives of the Far Realms can include, for example, aboleths (Monster Manual 8–9) that, in addition to their psionic spell-like abilities can be powerful casters. Such creatures would seem to be at a severe disadvantage on their native plane.
How would game balance be affected if creatures native to a plane that possesses the planar trait wild magic ignored that planar trait while on their own plane?