If someone is posing a threat to your business, 
it'd behoove you to do business competetively.  
If a gas station lowers prices, you'll often find 
that the gas station across the street will lower 
their prices accordingly, and not tell all their 
customers, "if you go to that cheaper gas 
station, you can never buy gas here again!"  Most 
customers would say, "fine with me!"

A hostile post such as Keigo's accomplishes two 
things:

1.  It establishes that Keigo/celga would like to 
have the freedom to pick-and-choose which of 
their clients gets first dibs on a YJ auction, 
while denying celga's clients their own freedom 
to choose among deputy services for a given 
auction, by conveying the sentiment 'if you go to 
someone else, I'll never do business with you 
again.'  It may not be very good business to 
punish your own customers because another 
(cheaper) service provider is now available.

2.  It provides perfect supporting evidence for 
an argument in favor of anonymous posting.  :P