OMG, you should do some research before you try and school somebody. You are charged per item you wish to trademark, so nobody is picking everything within a class.
Select the items that apply to your business
Once you've chosen the class for your trade mark, you still have to select the appropriate items within that class. Classes are broad, so you must further specify the items in that class you wish to protect. Then your application will only apply to those items.
Example
You produce acrylic false nails. You use the pick list and find out that you should choose Class 3 to protect your brand. You tick the item acrylic false nails. But there are dozens of other items in Class 3 including aerosol hairspray and carpet shampoos. Don’t tick those items. You're specifically choosing to apply your trade mark to Class 3 acrylic false nails, not all of the others.
(from trademark Australia application form help files)
Example:
SKY VOYAGER
Class 25:
Apparel (clothing, footwear, headgear); Clothing; Baseball caps; Sports caps; Caps being headwear; Polo shirts; Printed t-shirts; Sports shirts; T-shirts
FLIGHT OF THE WICKED WITCH
Class 25:
Clothing, footwear, and headgear for men, women and children - namely, shirts, t-shirts, sweatshirts, jogging suits, trousers, pants, shorts, tank tops, rainwear, cloth baby bibs, plastic bibs, skirts, blouses, dresses, suspenders, sweaters, hoodies, jackets, coats, raincoats, snow suits, ties, robes, hats, caps, sun visors, belts, scarves, sleepwear, pajamas, lingerie, underwear, boots, shoes, sneakers, sandals, socks, booties, slipper socks; swimwear; masquerade and Halloween costumes; paper hats
(side note, People also use trade marks to stop people from hurting their brand. Example: Turner Entertainment Co. may have no intention to sell Wicked Witch lingerie but they also don't want other companies selling it).