As someone who fishes, buys fish, and spends a lot of in game time filleting fish, I agree that this aspect of the game is quite possibly the worst implementation of what fishing could be.
It's the most monotonous, time consuming, and unfulfilling content in the game. It started off being fun that it was a market that could help me make money consistently to afford my housing and build creation habits, but it's turned into a chore that I just can't seem to do anymore.
Honestly, I'm surprised that roe is selling for as cheap as it is. There are many things that I could do with the same amount of in game time that it takes to get 1 roe that would net 3-5x the 'inflated' price that it is on PC NA right now (~40k/ea).
I've made hundreds of thousands in the same time frame with carries that I'd consider easy, but much less monotonous. Carrying or selling arena weapons feels like I'm actually playing the game. Fishing feels like I'm wasting my life.
Here are my stats since I started using an add on that tracks it:
0.96% in almost 50k fish is pretty disheartening. Even 1.5-2% would be a HUGE and noticeable improvement.