I don't think developers are trying to charge more. There's a massive grey area between entry-level and luxury finishings.
Few people want to pay for luxury, but almost all buyers expect value from low-end finishings, and it's the value-priced but decent quality finishings that are in demand.
There's a massive difference between a $750 a square foot and $1,200 a square foot unit.
In any case, here's the latest affordable housing development proposal: 73-unit affordable housing complex proposed for Carey Road near Uptown Shopping Centre