"Imagine setting up shop on a platform perpetually prone to security vulnerabilities."
Of course, you are referring to Windows with that statement.
As a hard-core GNU/Linux user and advocate, one may think that I would be inclined to agree with you.
And while it is true that Microsoft gets a lot of bad press (of which a given amount is certainly deserved), other platforms (including those running AIX, GNU/Linux, FreeBSD/NetBSD/OpenBSD, HP-UX, Mac OS X, Solaris, etc.) can be just as vulnerable to attack as Windows if not managed correctly.
Conversely, I have seen instances of Windows that, due to thoughtful application of security policy and deactivation of unnecessary services, were extremely difficult to exploit, and once actually exploited, properly contained and minimised the damage.
No operating system or platform is bullet-proof, and all operating systems are "perpetually prone" to security vulnerabilities of one kind or another.