If there is, I don't know of one. History teaches all sorts of wonderful analytical skills that I use all the time as a start-up founder - it's great training

If there is, I don't know of one. History teaches all sorts of wonderful analytical skills that I use all the time as a start-up founder - it's great training for what I do. However, by the time you make it a significant way into a Ph.D. program, you get ruined culturally - you end up thinking you're going to get a job in academia, or you're a complete failure. Switching careers after your mid 20s feels like an impossible undertaking (it's not hard at all, but we're talking about feelings here), so you keep on slogging it out. If you do come across some all-but-dissertation from a good program who actually wants to try new things, snap them up.