What is the average cost to design a security token? With or without investor dashboard?
As far as I know the cost of 'designing' (if you mean coding, creating) a security token is similar to any other utility token. The investor dashboard is a part of the ICO, you shouldn't mix these costs from business point of view.
First of all, SECURITY is not the same as UTILITY token. You must know the differences. Please, you must take a look at the definition of security and utility token. In the various documents have already stated that and it will be so easy to understand it.