I work in the video game industry. My suspicion is that in recent years WotC's compensation model has shifted from publishing (which pays poorly) to gaming (which pays well). This makes sense as the D&D team's talent is most likely to be poached by video game developers. So WotC needs to pay competitively if they wish to retain their talent. That said, the Head of Creative role (which I'm guessing is the backfill for Ray Winninger) is actually on the low end of the pay scale for a comparable role at a gaming company.