How many customers do you have? I imagine most of the backend powering this will be the same as for iOS, so you can do a couple of things: 1. Give out promo co

How many customers do you have? I imagine most of the backend powering this will be the same as for iOS, so you can do a couple of things: 1. Give out promo codes. IIRC, you get 100 codes per app version, so if you've got a lot of customers this isn't really feasible. 2. Discount the product for a given time period (ie the first 24 hours you're live) and blast out an email to existing customers. In the backend, you can even set automatic price changes so you don't have to go and manually change it back. 3. Release a new version. Customers are used to paying for major updates. If you give existing customers discounts on updates, see #2. This brings up another question. In iOS, there is no good way to charge for an update - user buys once and gets free updates for life. Will they change that with the OS X App Store?