Every design analysis, implementation and sign-off requires library models. You are a design house and chances are creating library models by itself is not your differentiator. Hiring/training/retaining full time characterization resource, buying additional software licenses puts additional burden on your finances. On the top of that, your team is constantly worried about quality, spice-correlation and compatibility of models to design analysis, implementation, and sign-off flows.
Let Paripath take care of your characterization needs in a cost effective manner, freeing you from library modeling headaches and allow you to put resources, where you can have competitive differentiation in marketplace.