The most expensive Managing Agent(MA)

Is AHPETC the most expensive MA? Apparently it is since 2014. No one
charges anything more than AHPETC after 2014. How many dollars did
AHPETC overcharged its residents compare to market rates ie PAP rates?
 
AHPETC and the other town councils are all Managing Agents of housing
estates, single constituencies of GRCs. Did someone say overcharging the
residents is naughty and unacceptable? Or