How about a non-cynical answer. Software does not have effectively zero marginal cost per copy. It does have zero manufacturing cost per copy, however support is quite an expensive on-going cost. When you have a presence in multiple markets, you need localized support for different languages, and that is even more expensive. When you have different costs in different markets, you encourage users in more expensive markets to try and game the system, to minimize their costs. This sets up a potentially adversarial relationship with your users, and is mostly non-productive.

In the end this is a professional software suite, and running a business has some fixed costs. By comparison, Adobe's suite would cost much more per year.