MacsAndStuff

Hmm. According to ars technica, it costs $54.95 to upgrade a copy of Mac Dictate to version 1.5.

MacSpeech Dictate gets 20% more accurate with paid upgrade

So, you pay 27.6% of your original retail price ($199) to get a 20% accuracy bump as well as a vocabulary editor for customization. I guess that sounds worthwhile.