I'm pretty new to trading and am wondering if there is a way to find out what's fair so I'm not ripping myself off. It seems like if I'm trading for what I can get on the shelf beers with someone in a different state with the same kinda thing than $4$ makes sense. But I'm wondering if there's a place on this site where I can get some backup, a second opinion, to make sure I don't screw myself or someone else. The trade in question that brought this up is trading Citra for something like Bretta Rose 1:1.
There isn't one general thread for this topic...although maybe there could be. Right now people just post up a new thread with the beer(s) in question that they want to talk about. I can't comment personally if you trade is fair or not. If both parties are generally happy then it was fair...everyone is different and everyone will have varied opinions as to what is even/fair/a good trade.
$4$ is an alright place to start, but I've found that obviously everyone values certain beers differently. Ask any of the top traders on here their opinion of Dark Lord
Start off with $4$ then ask yourself if the beers being traded for are of similar rarity and desirability. If they are of similar rarity and desirability, then it's nice if the side in which the beer costs less add some locals or something else easy to make up the $ difference, IF the difference is significant. A good trader will recognize and volunteer to add (during discussion). Unfortunately, "similar rarity and desirability" is always open for debate and you can only get a really good sense for it if you follow the trade market(s) closely. In the case of Kern Citra for Bretta Rose, strictly on "fair trade" I'd say the desirability/rarity of Kern Citra and BR are similar, with the edge to Kern Citra, so it would be nice if Kern Citra side add something small. However, given how Kern Citra trades nowadays, 1:1 isn't all that far off and both sides should be happy with the trade.