That's a reason why real estate may be excluded. All this stuff is tracked however, and things like food and energy may or may not be included in certain numbers as well. Energy can be affected by things like wars, natural and unnatural disasters and shutdowns, while food is subject to extreme weather, diseases, fuel costs etc. However you want to count it though, all these things either directly or indirectly affect the cost of everything else eventually.

The things affecting a family of 5 and the things affecting someone running a business are very different, so various tracking methods and numbers are used.