Gotta love people who make rules that state a vague thing like leave a message ... and you do , but really mean something specific instead like 'this is a one sided trade because of this'.
Or 'don't ask what I would offer.'
When peoples ideas of rarity vary so much, if someone doesn't know what another person would consider fair, they ask that question without adding anything on one side because unfair trades are canceled so quickly without the chance of even trading.
Or when they say 'Ill overpay' but when you offer an overpay trade with the chance of them editing it to THEIR liking... they cancel it instead saying im not overpaying.
Or people who put pets in a swap group, then wont trade 2nd gens (that they have doubles) for other 2nd gens (that they dont have) just cause they're ungrown. As far as I know, 2nd gens have never split outcome.

has had a really bad day with trades