The person who (by very far) has worked most on PRT (podcars) demand/cost analysis is Göran Tegnér (URBANET ANALYS AB) of Stockholm ([email protected]). He works with Dr. I. Andréassen of the (KTI) Royal Institute of Technology (who does simulations). You should direct your questions to Tegnér.
I very recently wrote a short summary of some of their work, but it is in French (and part of a report to the Greater Paris Transit authorities): let me know if you want it...I have a number of the papers cited and could send them to you also....