Meanwhile we that are here do not know about our tomorrow so...
My thoughts too, and I feel like it is too quick to draw a conclusion to his own story without having to ask him to know what exactly is happening. Sometimes we judge too quickly by what our instincts tell us without necessarily knowing the true color of things or situation of the things we thought we knew. Because OP thinks that the man is not picking his wife's call as an issue, that may not necessarily be. Like you have mentioned, it could be that his life has been medically predated to last for a while and he just had to spend the rest of his life having such fun.
That could just be one angle to many scenarios that may have led him to spending like that. Another angle could be that he is just spending a pinch or a peanut from what he has in his bank account and I know there are a lot of people out there who are extremely or stinkingly rich and always have budgets for their funs. And such little budgets that they take out of the funds that they have in their bank accounts to catch fun with it might be what OP seems to be extravagant.
That could just be less than one over hundred of his wealth. Maybe due to the nature of the job he's doing, he needs to spend some cash for his happiness and that you cannot take away from him or easily criticize him for doing. So next time what I think is best is to either ask the man, of his expenses and get a clear picture of why he's spending so much. Or one can ask people around to have an idea rather than just drawing a conclusion from the scene witnessed. Which includes his wife call that he may had ignored.