You may be right that it won't be a "big seller", but Visual GDB seems to be targeting more than just Rappberry Pi development. From the product site [1]:

"Harness the power of the Visual Studio debugger when developing:

o Embedded firmware (ARM, MSP430, PowerPC and more)

o Native Android libraries

o Linux applications and drivers

o MacOS KEXTs

o Linux-based embedded modules

o Any other applications that use GDB"

[1] http://visualgdb.com/