that's interesting to me, cause the complete opposite worked out for me well. I treated 9-5 work as a necessity to put food on the table and pay for rent(I always tried to find a comfy job where I can put in a few hours/day max and survive), and my side projects as the possible real money makers. And it worked out very well for me - have been able to achieve my main goals in less than 10 years since graduating.
