Rule #1 in the "recommended" section
#1 - A minimum of 15 positive feedback on CAG is recommended, both for the seller to be more trusted and to receive a fair amount of bids, as well as for the participants to feel a certain degree of comfort in dealing with an experienced trader.
Unfortunately, making it a requirement probably isn't something that is going to happen. Frankly, unless everyone simply boycotted the lowballs of non-established members, there will continue to be these kinds of issues. But, that's never going to happen because someone always wants to pop into the sale on the last day of the guy with one feedback and grab a few things for a buck apiece.
The majority of lowball issues have been from newer members (or members that have been here for years but never posted until their lowball pops up) getting money and skipping out, not following through with the auctions, or simply bailing like the OP apparently has.
Still, older members have been guilty of similar things as well, which is why I will continue to recommended everyone do a little research on the person holding that sale before bidding just like you would do anywhere.
Also remember, 15 feedback doesn't mean that much either and, every 15 is different.
Feedback from a guy with 14 that traded/bought a bunch of codes two years ago isn't worth nearly as much as someone else that has bought, sold and traded with solid results in the recent past.
Sometimes I wonder if anyone actually looks at more than the feedback number. Dig in a little bit just like you would on Ebay!