It seems some people are greedy or stingy.
Some people declined cross-trades which i’m trying to complete their collection unless it’s below 50% (or something) which looks stingy. On the other hand, there are greedy collectors who will trade your dupe with something you don’t interested in and the worse, some of his/her collection are mostly not in your collections or you don’t have something in common for collection.
How do you deal with these such people?
P.S. I always follow the tips about trading to avoid being ripped-off.