The logic behind long term tenants

[Roy C.]

I don't understand people who are long term tenants, and the logic behinds it bothers me. 

They are paying monthly rent to other people, which doesn't make sense to me. If they have money to pay rent each month for long period of time (I am talking more than ten years), why not save and buy their own property? From what I heard, there seems to be a vast amount of long term tenants. 

Am I missing something here?

Can you guys share the story of your long term tenant and why do they decide to be tenant instead of a homeowner?