The costs are not missing, no, but there is some work left to the reader/end user in the form of figuring out which skill goes into which (obsolete) skill category to figure out the skill cost. For example, if I want to know the skill cost for swimming, I first have to either know or look up which skill category swimming belongs to. I'm sure this is not a problem for experienced RMSS players/GMs, since they have all the categories memorized..
My suggestion, or request if you will, is a table that shows all the skill costs straight up like the one in the back of RM2 Companion II.