From Guild Wars 2 Wiki
Update - April 6, 2013
In order to address certain exploits, the following changes have been made to summoning Guild Vault Transports:
- Guild Vault Transports are now unlocked with Economy level 5 instead of Economy level 2. The cost has been increased from 50 influence to 1 Guild Merit and 50 influence.
- Guild Vault Transports can no longer be summoned in instances.
Guild Wars 2 Wiki Notes
- Build: 17,583