I think we might be getting confused here, an upgrade usually costs as it replaces or brings something new to the table, (Trading one instrument for the latest version is an upgrade) however an update takes what is there and expands on it to make it even better.
Updates (Normally for a limited time) are factored in when the price is set by the manufacture, so yes, they should be expected by users. (Unless they bought the instrument after the final update was released)

Bill