If I am in your situation, I will do it.
People regret what they haven't done.
I would like to have a PhD than 5M asset base. Most in the forum can build such an asset base but not that many can get a PhD.DO IT !
But if you reckon your asset base is not enough, decide whether you want to start at 39 or a few years later. You may want to build X amount of asset base before starting a PhD.
I'll take the $5M any day. I wouldn't care who has a PhD
Having a title doesn't mean bugger all in life. If you go on to do something special in your field then yes thats something.