[aktillum]

Achaea was like this for a long time, with skills being locked to class-based guilds. You were allowed you to quit your guild with your skills intact at guildrank 3. But they moved to an auto-class system and turned guilds into Houses that accept members from multiple classes (usually 3-4 classes per House, with 3-4 Houses per city) and though a small portion of the of the playerbase cried doom and gloom and the ultimate death of RP in Achaea, the game has been much better ever since.