It appears that it's for some of the same reasons why people don't want to just swap their car - when you have a large asset that can be in a variable condition, you don't really want to be swapping it for another one randomly.
It appears that it's for some of the same reasons why people don't want to just swap their car - when you have a large asset that can be in a variable condition, you don't really want to be swapping it for another one randomly.