Some players have multiple characters that can open shops but on the same account. I personally would like the option to open all my shops for my guild members at a cheaper price, but this is currently not possible.
Please consider allowing more than 1 shop opened per account. I currently don’t see a problem with this as some players create multiple accounts to do this already. Current system is only punishing players that play by the rules and stick to one account.
There are many shops already open so this would not affect the shop markets.