For reasons I explained. People will generally pay anything to live a little longer. Combine that with the fact that when you have an unhealthy lifestyle money might buy you a bit of time, but its diminishing returns and all the money in the world wont buy the sort of full life a healthy lifestyle will.
So with the diminishing returns on spending on health combined with the unhealthy lifestyle this is exactly the way I'd expect a chart to display when it is done using bad scientific practices like not normalizing the data for lifestyle and cultural choices.