Price fixing by Apple? Not allowing the creator to do as he/she likes with their product.
The creators of the product can do with it whatever they want. Nobody is forced to use the MacStore to distribute the Application. It is your choice how you want to distribute. But if you choose any distribution model, you have to play by the rules of that model. It is not uncommon that distributors/retailers set rules like this. You don't like the rules - choose another way to distribute, luckily there are options.