I think there are a number of reasons they've become involved in it. Part of it could be that even within the development community, there are individuals who have an interest in nature and want to see nature in developments. Another aspect of it is the marketability of it. The landscape is actually quite attractive. A lot of birds will come to visit these naturalized wetlands, and it creates a diversity in the community.
Another aspect of it is maintenance. The installation of the native prairie grassland and the naturalized wetlands is comparable to laying down sod and creating what we'd call a normal manicured environment, but down the road the maintenance costs are lower because we have to do less management activity to a native grassland that's installed correctly than we would in mowing turf.
There are a number of benefits, and the idea that developers want to do something good for the environment can't be ignored either.