Hi,

Ive just bought a 2nd hand Inspire1 which i am intending on using as a fishing drone.   I am only intending on flying it around 300-400meters away, and it will always be in sight visually.   Is there anything problematic..  it will be good because the line will not get wrapped aroudn teh camera/gimble..   And we are not really that interested in taking pictures.
Additionally dropping the camera means less weight..  I'm hoping to carry around 1 -1.5kg

Yes, you can fly Inspire 1 without camera, no problem whatsoever. But don't count on 1-1.5kg payload, this drone is not designed to carry that much ...