SGG has said, due to small team, spend depth is important
Trade significantly reduces spend depth, so no trade
Quarterly revenue
Maybe when the quarterly revenue takes a dangerous drop ( AKA because servers are relatively cheap - 3 months with no purchases of Path of Valor, VIP, or deals OR Zynga develops a more profitable game )
But there are lots of 10 to 11 year old freemium games doing fine and the iPhone App Store is only 13 years old ( July 10, 2008 )
5* duplicates
The best we can hope for is something for duplicate 5* heroes like Alchemy Lab shards or alliance war chest ( all alliance teammates put in duplicate 5* heroes, when threshold met, teammates can pull out random loot )
So even that would not apply to a 4* hero like Jackal / Falcon
