Why would BB bother. This is a free to play game but they have to make their money somewhere and that is from people buying gems. A L50 player with a decent island isnt go to buy gems whereas a mid L30 or mid L40 player will see all the eye candy that BB is introducing and will be more likely to buy gems to improve their position / make life easier and therefore their development focus will always be;
- Make it easy for people to understand the game - they introduced more early tutorials
- Get them hooked - early on the complaint was the game was to slow so they introduced lots and lots of sub quests to keep people interested
- Get them to spend money - so most new facilities make people want to get gem items.
Seems like a sound business model to me......