Up to you, but I wouldn't buy it unless you know you will use it! Guess it's a personal thing.
Scales, yes, you definitely need those.
I guess some of the things, you should buy because you should shift to using them - cottage and ricotta are on some of the menus - ricotta on toast, cottage cheese as a snack. The hot choc powder like Jarrah is a good idea if you think you will use it too.
Maybe it has cut down since the last time i looked at it closely!

I made casharoos and raw cacao balls for this week. Have cut up carrots and watermelon and ready for snacks too. Didnt get to premake my smoothies but will do them in the morning and some chia pud too.