That's an interesting theory that's not supported by historical evidence as far as I can tell. When computers were expensive, there just were less people with access. The systems were not any more secure.
For example, the parent article, the one this comment is ostensibly in response to, has nothing to do with operating system security.
A better example is maybe instead of Google spending $xxx,000 to develop the system that was found insecure they should have spent $x,000,000 so they had more resources devoted to the security aspects.
Perhaps this is too high for this system to exist; well maybe that system just shouldn't exist if it can't be secured properly with the budget for it.