Why people play on multiple worlds? I never understood this. I can barely play one world, I have a life to live.
This could be a separate topic for discussion. There are multiple reasons, not all applicable to all people who play in multiple worlds. A few of the reasons are:
1. To farm diamonds in the secondary worlds, to use them primarily in their Main world.
2. To test new features and report bugs (city on beta server)
3. To develop different cities with different goals/ play styles.
* a well balanced and advanced city.
* a city devoted to attack / plunder.
* a diamond farm city (or multiple D cities).
* a city geared to production
* a city to collect GBs, to build all GBS available, regardless their efficiency.
* a small city (goal, advance the city as far as possible, without adding any expansions.
* to play in a different world and join or maybe lead there a guild that is an extension of the guild at the original world.
* to develop a city without buying / using any diamonds.
(List not intended to be complete, others may exist.)
You only got time for just one city/world? OK, enjoy. Others have more time, or can do more with less time than you do.