its good to offer a couple different varieties. obviously they love and devour their apple sticks but maybe offer a harder wood that woudl take less time to chew.
but i have to agree if you have the ability to prepare your own or you have unlimited funds than you can spoil your chins with unlimited wood!
personally with the amount of chinnies i have, each one gets one nice piece of apple wood every night. sometimes i will give them a thinner twig in the AM, especially if they are sitting at the front of their cage looking at me with those sweet eyes! i also keep plenty of fresh wood shelves and houses in thier cages and each one has a hanging toy, although unless their is apple wood on it they kinda ignore it!