I wish that too.
I recommend you do a product which its easy extendable and a choice of using a correct power supply
Let me explain.
Power supply of 2 types: for up to 5 meter lenght, and other type of up to 10-15 meters
Strips of 2 meters with a connector at the end that you can easily add additional 2 m3eters (or 1 meter).
So its easy to have 1 meter, 2, 3, 4, 5 up to 15 meters of strip.
That will sell a lot in my opinion