I think that the less the job income affected my bottom line, the less I would care about performing well at it. If it was 10% of my income I would care even less. After all, I'd rather be working on my own ideas than someone else's.
If you are a freelancer doing one job a month, each one accounts for less than 10% of your income. Where do you draw the line? Do you do a shitty job for a few of them?
