At some point, you have to say f...u to this whole GC, citizenship etc etc. If you still have distance to go before you reach there, please keep on going....
You are not free to do what you want. The GC is meant for a future job, and technically that point in future arrives when you get your GC, and if you don't honor that potential problems could occur during citizenship, and btw GC can be revoked anytime in the first five years..I saw a lot of information in a FAQ in a forum "life after green card". You should check it out..I think most lawyers recommend sticking to your job for 6 months after GC, of course anybody can do what they want. This is just a conservative approach.