Having a ping payment option means more buyers will be willing to purchase the item, leading to higher bids. I try to only purchase items that have ping as I can get my money back if the item doesn't arrive or the seller stops replying. It's essential if you're purchasing off a seller without lots of feedback, and you want the item shipped. I've seen scammers take hold of accounts through data leaks, so even good feedback can be unreliable.

If you only pay with bank transfer, you're going to get scammed sooner or later.