A 2k reward for just growing your daily experias is already plenty. It's not like more or fewer experias being grown has much of an effect on the server economy. From what I hear fishing does need tweaking, but I don't do any so have no input there.
I mean it's not like you're meant to actually make money from growing Experia patches.
It's just a nice "congratulations!"
Think of it as a hard to enter weekly lottery. Except you can track the ongoing results by a leaderboard... xD