Agree with all thoughts, but as per my views, it is not all about the cost you incurred to developed a product design, but once you through with the thought process, your sentiments automatically get attached with the product features or design, So ofcourse no body will simply let it go. Thus, it's always important go get it patent.
In the market two things are very important, if you wanted to compete, one always put true facts of your product, customers want you to be loyal, and other thing, your invention needs some protection which will lead you and your product at the height.
Today, we can see the number of branded companies are being preferred by customers, just because of above two reasons (many other factors are also important and are understood).
For example: if apple is inventing some new features that will surly cost you & the company more, and after sometime samsung also launching the same features that will dismiss apple image indirectly. see how, if same featured product launched by samsung is not much user friendly then customer will avoid taking that featured product without knowing " Who is the real one & who is the mirror image" . So one way apple will be losing its sales, and the cost heavily incurred to made original product (made by apple, its R&D costs) will become as a sunk cost.
So as per my understanding it's very important to get your product, its features, and its design patent and show up the real things and mark the difference. Thus, the customer can also make the difference.
Just my thoughts..
