I believe for most passengers on DXB-BKK this is just one leg of a longer journey.
I would assume that Thailand (or some secondary places in Asia) is the final destination for most EK customers, but they will come from Europe or some other parts of the world.
For Thai many customers connect (also to primary destinations in Asia/Australia) - EK customers would fly directly there and not touching BKK.

For a fair comparison you would look at the traffic Thai is carrying between BKK and Dubai, the middle east and europe (on their many flights to the area).