how many copies of the app do you expect to sell in total over say 3 years ?
what will the pricing be like per copy ?
i am not asking you to tell me all of that but rather that you need to look at that and see what the cost and the benifit really are.
I have seen folks who wanted the full on copy protection when they were selling to a small number of users and honestly in some cases the users they were selling to would not be pirates of any software unless it was by accident.
if your stuff needs it go ahead and do what you need. just make sure it's worth it for your app and it's market.