Exactly. Plus, the range is worse by approximately 80% (depending on the DJI model), the battery life and maximum speed are lower by approximately 20%. With the camera included, it is 50% more expensive than a Phantom 3 Advanced.

On top of that the field of view of a GoPro camera is too wide for a drone, DJI have a much more adequate setup. GoPro should have at least supplied a small lens that would fix this problem.

As for portability, assuming that one would be using each brand's backpack to transport each drone, they are actually very similar in size:

GoPro: 540 x 320 x 150 mm DJI: 447 x 318 x 229

GoPro would have a much better chance if they had entered the market at the right price (~500 USD) and emphasised the qualities they are known for - durability and reliability.