Yea, that's the key. Being aware that you might be taken for a ride and willing to eat the loss. Balancing that personal cost/risk is the actual game ... no matter the platform. Low feedback is mucho better than no feedback but there are some sellers that manage to game their feedback score, too (aka ebay et al).
It doesn't take much for a single transaction gone wrong to find yourself behind in the end. I'd question whether nominal savings on already inexpensive items would be worth the heartache.
To be clear, I'm not saying you shouldn't. There are plenty of good and honest folk that will follow through and everyone's happy. But, the scammers are also mixed in there. Figuring who's who is not always straightforward. Particularly for cash only transactions ... through the mail. I too have taken such risks in the past, sometimes on high value items, but always under very specific circumstances or for specialty items that are not targeted by scammers or are in high demand. I've also encountered counterfit items or strange events while in transit (name it, it's happened) on items that would be an excellent deal if it had arrived ... but rarely ate it in the end and always got my money back (CC or other protections). My risk tolerance has changed over the years to the point of paying an extra twenty to a vetted seller versus the lowest cost ends-up being worth it in time and frustration.