Lord Mark said:
Hy !
I know it was spoken about the hero equipment but it is very
unpleasant when:
- u win lvl 4 chest in BG and u get the same blade in all that chests.
- u buy lvl 4 chest and u get the same blade in all that chests.

It will better to exchange in market the equipment.
It is ridicuolus to spend 30k saphire on the chests and sell them for 4k mooncoind couse u get duplicates.
Conclusion :
BLACK MARKET HERO EQUIPMENT EXCHANGE
There are certain in-game values that can be traded: like basic types of Resources and Scrolls. However, there are also many other non-tradeable in-game Items and Resources. We are not planning to give you an option to trade them or send them as a gift to other players.
The reason is that we're striving to maintain the game balance. Players receive a lot of Items that should be used on certain levels or Castle development stages. However, they are credited for your personal in-game activity, and they were not designed to give any benefits to other players.