Absolutely! You got literally nothing to lose. Its at least 10% EXTRA onto your ATAR.
It's great in year 11 for sure!
In year 12, you can argue or not whether it might be a waste of time. You work just as hard as every other subject but you only get 10% of the reward. Say you spend a lot of time working hard and get 40 instead of 30 for your bottom subject. That represents a change of 3.0->4.0 contribution to your aggregate. It's literally a change of 1. If you worked slightly harder in each of your top four, you could easily add .25 (if this is even really possible) of an aggregate each to them and have it add up to 1. Even more likely add +1 to each of your subjects and raise your aggregate by 4 instead of 1.