Silver is worth striving for if not able to reach higher.
Priority checkin, extra luggage allowance, international seat selection and 50% bonus points.
Yes, but someone who barely flies enough to earn Silver probably won't get a huge amount of benefit from any of the above. I speak from experience of being QF Silver for 3 years. If the OP can persuade QFF to grant Silver for free then fair enough, but I would suggest not going on a status run.