That makes sense. Rightly or wrongly, I perceive Mentor as having lots of users who cater to companies in industries like telecom, medical, or A&D who aren't very pro-FOSS (on a corporate level, at least).
It would be cool to see them open up access to their tools somehow though; Library Manager, Valor DFM, maybe even something like HyperLynx. Not sure how open people would be to some sort of royalty agreement in exchange for access to CAD tools.