[maxsanic]

many can means high in number but not high in percentage.
take eg a hundred thousands is many but if represent as percent of two million labour force
that is quite low.

HWZ high ses? 

Yea, I reckon from the official statistics the proportion of the labour force earning above $8k is around 25%.

Singapore's resident labour population is around 2.5 million, so we are talking about ~625k people with income above $8k. It's a lot in both absolute and percentage terms, that's why I don't understand why the letter writer is reacting like he's very surprised that there are so many people around him making that much.

The stats and what he sees on the ground tallies nicely.

As for HWZ, haha I doubt you will find a lot of the 625k people in that forum.