Cubeville/CubeConomy — comment on commit ed0ef8d41d9b45cfaa5835f3aaa3da6d7a0baa93
File:  line 0
By Sleaker:

if you don't change the plugin name and packages you shouldn't manually be adding your own Vault implementation as Vault will still hook this by itself and still report it as iConomy5 - saves you re-writing the hook and maintaining it.

It also can cause some confusion on which hook to use.