Thanks for reporting this, it's not a topic I was actively looking at.
Ok, perhaps RS are more expensive than Abbey or others however they are still discounting the price they usually charge. I appreciate the fact they are doing this. You make your own decisions on which traders you use. If you don't like them then don't use that particular trader.
There is NO need to air your grievances in a group buy thread where everyone that is taking part is aware of the costs. They are choosing RS because they have looked at the big picture.