Multiple organizations msd crm 2013

Hi there,

Please suggest multiple organization idea is good or bad? as part of business expansion we're adding there zones, so we decided to create separate organization for each zone(like East, West, South) to separate data. So I want know this is a good idea or not.

1. Can I use 1 CAL for 3 organizations

2. Should I take any licences for each organization

3. Can I call data one org to another org

4. If I use single organization my database grows to 80GB what would be the server performance.

5. Please let me know if any other challenges you people faced

I'm using MSD CRM 2013 SP1 On-premise installation

Thanks,

Kiran