It is bad to not finish a job.
Damien is a contract artist doing a job when he gets an offer for a higher paying job.
Damien wants to accept the higher paying job.
Damien works hard to complete his current job then starts the higher paying job.
Damien stops doing his current job and starts doing the higher paying job.
Damien will have a reputation as a reliable artist.
Damien's reputation will suffer if the person that asked for the current job tells potential job givers he is unreliable.