"Selfless people have no purpose in life. How could they? They have no self to achieve anything with."

Selfless people serve no purpose that they're aware of because they serve the desires of others, however I do think it is impossible to be selfless. And not impossible in the sense that it's difficult to do, but because no matter who you serve, you serve to serve your selflessness. Does that make sense? Like someone who advocates the Lord serves to save themselves from eternal damnation. The act of serving another simply to permeate goodness in the atmosphere, yet the selfless act has a purpose other than to assist another, as it also aims to show the person performing this "selfless" act that they are indeed selfless. When in all actuality they too are selfish, but in a brainwashed kind of way.

Sounds like a tool to me. Good point, Emmm. Of course, this kind of selfish advice would serve me well, as it aims to invigorate my desire to live for myself with no convictions to another, to live freely of mental slavery.