This is exactly my point, that feedback is bullshit. One guy was mad that I didnt want his gun in a trade and I didn't reply to him for a day as I was away for the weekend and the other guy blew me off for a month so I left him negative feedback so he gave me negative feedback. The 58 other people I have dealt with had no issues
Take it from someone with a really high feedback rating: document every transaction. I keep nearly all communication on NES in PMs. If the other guy loses his mind, I have all the proof I have to show what was going on.
Revenge feedback does happen, although I've never had to deal with it. If you got negative feedback and it's not true, send admin a screen shot of the dialogue in question, and he will make it right if it's in fact bullshit.
I haven't given a ton of negative out, although I have unfortunately had to do it recently several times. I give people A LOT of wiggle room. Being blown off/ghosted is usually the biggest problem, and I give several days at least before I start getting annoyed enough to skip this person, give bad feedback and move on.
We sell things here on NES for money. When people delay that, they take money from me. I've had TWO separate instances back to back in the spring where Guy #1 wanted it, claimed it, guy #2 wanted it, was backup. Guy 1 disappears for a week. I move onto guy 2 and he's bought something else. Now I have to f***ing price drop a few weeks later because guy 1 is a waste of time and money.
It's real simple, buyers. If you want the item, buy it. Don't disappear after you claim it and start working on the details of pickup. Because you will f*** up peoples transactions. if you can't commit enough time to negotiate the deal to a pickup, don't friggen PM a seller. Shit happens, we get it. And I wouldnt give someone negative feedback if they had a valid excuse as to where the hell they went, but it's yet to happen.