ERPs along the river

Chinatown Business Association feedbacked to LTA that ERP charges are be having a negative impact on business.

The gantries along the river has divided the City into two ie. the Eastern City and Western City.

But the ERP seems to have affected the Western part of the City but not the Eastern portion. Why is it so?

Or is it that the gantries have actually affected both sides of the river? The focus has been on Chinatown because the Chinatown Business Association has done a good job in raising their concerns to the Authority.

Or is it that Eastern City people had been going to Chinatown for lunch and shopping in droves in the past? With the gantries, are the Eastern City people now unwilling to cross the river for lunch and shopping?

The point I am trying to make is - Why the river gantries affected Chinatown area so badly? Any negative impact noted for businesses on the other side of the river?