And BTW, my use of the term "parasite" was not meant to be derogatory. But that is simply the most accurate term that comes to mind to describe the situation:
"par�a�site [par-uh-sahyt] Show IPA
noun
1. an organism that lives on or in an organism of another species, known as the host, from the body of which it obtains nutriment.
2. a person who receives support, advantage, or the like, from another or others without giving any useful or proper return, as one who lives on the hospitality of others."
