3rd party solutions are NEVER going to be an easier way to bitcoin security. You can always make your server at least as secure as any 3rd party server, and because unix security is a known problem you have lots of resources for improving it.
I'm afraid most
merchants are not security experts and operate on a string budget.
They need to outsource IT anyway.
The most common choice is probably between hiring a student or using an existing 3rd party solution.
Please get real.