提案/Suggestion
Lower the zenny cost for upgrading armors. The material costs are already lower for armor (think: 2 Wyvern Gem Shards for a grade 8 armor upgrade versus 4 Wyvern Gem Shards for a grade 8 weapon upgrade), so why not the zenny costs? It is extremely expensive to overgrade armor pieces for what benefit they bring.
現状/Current Status
The zenny cost for upgrading armors is equivalent to that of upgrading weapons.