This is a two part question; firstly, does anyone out there have some insight as to why PHP contract developers would be available at a much lower rate than their .NET counterparts (around a 30% premium for the Microsoft guys)? I have some theories relating to ease of learning and cost of tools and servers but would like to get some feedback from other people.
Secondly, what is the impact of this on total project cost and ongoing maintenance? Generally speaking, would you consider the total effort for a typical website build similar for the two or does one technology impose a premium time wise?