Comment by Tallain

You can find a condo cheaper and also much more expensive. There's also often a hidden "farang tax" where you will be charged more simply because they know you can pay more, regardless of the quality of the place. This is where the variance comes in. It happens with certain services, especially things like taxis (but not Grab or Line Man).

But yes, Bangkok / Thailand in general has huge wealth disparity. There are a lot of people living on very little money, and some people grossly rich.