I suspect a lot also has to do with the business opportunities available for developers on the different platforms. First of all, there is a near-limitless number of companies out there looking for Windows desktop developers to work on various inhouse apps.
Secondly, there is a lot more money in the business and specialist app market for Windows. I worked for 3 years at a company developing a Windows application. We charged $5k a year for a license plus a good 50-500 consulting hours to adapt the application to our customers business. That was a solid business targeting a niche market, and there are countless companies like that around in the Windows space. Those opportunities don't really exist for Mac developers. Most people specializing in Windows desktop development end up working on stuff like that if they don't end up at Microsoft/Adobe/Autodesk etc.
If I was to start a company trying to develop desktop applications for Windows there is no doubt I would target business customers willing to pay $1k-10k rather than trying to sell $10-100 to consumers. If I was targeting Mac users I would probably target the $10-100 consumer space.
Secondly, there is a lot more money in the business and specialist app market for Windows. I worked for 3 years at a company developing a Windows application. We charged $5k a year for a license plus a good 50-500 consulting hours to adapt the application to our customers business. That was a solid business targeting a niche market, and there are countless companies like that around in the Windows space. Those opportunities don't really exist for Mac developers. Most people specializing in Windows desktop development end up working on stuff like that if they don't end up at Microsoft/Adobe/Autodesk etc.
If I was to start a company trying to develop desktop applications for Windows there is no doubt I would target business customers willing to pay $1k-10k rather than trying to sell $10-100 to consumers. If I was targeting Mac users I would probably target the $10-100 consumer space.