In Malaysia, life is currently very good for .NET (and specifically C#) developers. If you have more than 3 years experience, headhunters will call/email you almost every day and try to poach you from your current company. The talent pool is not that big but demand for .NET developers is steadily increasing; and so is their median pay. It's definitely enough to be quite comfortable. As an indication, the salary of .NET developers with 5 years experience is on par with that of managers.
In general, "offshore" software companies (e.g. Monster has a dev center here) use .NET and can afford to pay well. For them it's a simple matter of currency arbitrage. Local startups, on the other hand, tend to choose PHP because PHP programmers are plentiful and inexpensive.