I do not like the way the rewards are repeated all the way down the chart. You could just make big blocks to show a large sum of money on a roll of 1-40. It makes it hard to follow.
You can also list a reward of acceptance into a group. Say the Art Guild wanted o recover something and they offer membership as a reward. The guild saves money and the PCs get access to favor and power.
I think the job board could be even better if it had a random outcome table. So based on the performance of the players, there could be a random positive or negative outcome, depending on how well they did.
You could also add a random bonus objective table, to add a bit of extra flavor to each job. So maybe the players not only need to carry item X to location X, but they must also do so without damaging it, or without being noticed by anyone, or without spilling any blood.