Yeah, it is pretty subjective by route. I tend to post deals for routes I know about, like Europe to Asia. E.g. OSL HKG it is pretty easy to find J fares roundtrip for about $1,300. LHR HKG that would be unheard of, so that price on the LHR HKG route would certainly be a deal, even though it's about the same distance, same carrier, etc.