Well, one of the reasons WABB is not streaming while the Clear Channel stations are is because WABB is not owned by CC... they are owned by Dittman Broadcasting.
Also, it comes down to money. There have been several stations that have cancelled their streaming due to new regulations concerning royalties.
As odd as it may seem, some stations do not care about streaming,m or at least see streaming as being useful. As long as the station can serve its listeners with it's FM signal, the station may not seek any further means of broadcastng such as via internet.
-Travis