Board Thread:Game Discussion/@comment-94.210.112.217-20130721153035/@comment-11612571-20130722172925

Leveling the armor is what slows the game down and forces a person to play this game for a long time, as it is unlikely you can quickly upgrade your armors. This takes time and dedication.

For a BKal (lucky you for getting it from a chest), you only get 80% of the XP points for enhancement. SDMarukokun stated that it cost something like  3 million to upgrade to level 70 using the standard strategies, add 20% to that cost and you are looking at about 3.6 million gold and a lot of materials.