Hi
I think the thing that bothers some people may be that when a spread increases by just one pip, to many intraday traders, this be the difference between being a net winner or a net loser - especially for newbies.
Granted, WS are ahead of the SB pack with forex at the moment, but if they were to say double their EURUSD & AUDUSD spreads, some existing clients may take their bat and ball elsewhere - due to the annoyance of having their bottom line profits significantly reduced, and feeling as though they have been handicapped in some way.