I think there are two reasons for that. For most of the items buyers will lowball you sending offers for up to 90% off listed price. Many sellers list with a room for discount. Those two bags may sell for around $60 too if someone makes such an offer.
Second reason, mostly for expensive highly covetable designer items (like Hermes Birkin) is to draw buyers to their closet. The sellers have it but have no intention to sell, they list it anyway for the price nobody's willing to pay. Like "look what i have". It's a marketing tactics, many brands and grocery chains are doing it, like a Black Friday sale commercials "flat screen TV only $200" but they don't mention they only had 5. Or Walmart is advertising something super cheap to draw traffic, they are not making money on that particular item but buyers are buying tons of other items with far bigger margin that can be cheaper in other stores. Etc etc.
Pricing games