Apps are apps and apps go on sale. If you have a premium application consider sales and promotions as a great way to increase downloads and usage. Also there are many app price watching sites (and even apps) that will pick up a change in your pricing and feature this to the public.
Every Tuesday App Promo will be providing tips on app marketing and promoting applications based on their experience leading marketing campaigns for applications across platform. These tips are like regular marketing vitamins aimed to boost discovery and visibility for app publishers to better succeed in the business of their apps.