How does a guild make money in WoW?
Each time you loot money from an enemy, an extra 5/10% money is generated and deposited directly into your guild bank. In addition, completing guild challenges will reward gold directly to your guild bank.
How do you get guild bank in gold?
The best way to make gold as a guild in Legion is to sell +15 or H Argus to outsiders, with your guild's help. Using your guild members' gold to replenish your guild bank seems like a taxation, even if it is to gear their alt.
What are guild bank repairs?
Repair NPCs now have a 'pay for repairs from guild funds' button available if your Guild Leader has set up permissions for you to be able to withdraw funds from the bank. You can use this to repair up to your daily withdrawal limit, if you have the permission set as such.