EA sold us game with incredible quantity of critical bugs. I don't have idea how it passed beta test phase and Quality Assurance.
If you want to how why you have problems with RCI balance look at these threads at official EA forum:
Compiled Bugs List:
http://answers.ea.com/t5/Miscellaneous-Issues/Compiled-Bugs-List/td-p/735282
and continuation here:
http://answers.ea.com/t5/Miscellaneous-Issues/Compiled-Bugs-List/td-p/735282/page/20
Traffic "AI"... This is why services and traffic are broken!:
http://answers.ea.com/t5/Miscellaneous-Issues/Traffic-quot-AI-quot-This-is-why-services-and-traffic-are-broken/td-p/737060