I have worked directly with several CTO/CIOs and one thing stood out. The y kissed my ass but no one kissed theirs. It is a very tenuous position that normally gets replaced when the weather changes. I was being groomed for the spot at a company, riding shotgun with the then-CIO. Weather changed, our CIO was out, I was retained (aggressively so) but my path to C-level was gone just the same.

If it falls in your lap, take it. But don't count on it. Leverage the extra money under the assumption that you're out in three months. It's position formed of a certain mix of competence, pedigree, communication ability, and politics. Tenuous.