Isn't that where everyone derives their ethics from (libertarian and non-libertarian)?
You realize that I need to reconcile your statement with Rand's celebration of greed and view on altruism as another form of greed.
As I just replied, I'll answer this tonight.
Please respond when you can, no rush. It is a coincidence that lately I was quick with my responses.
Traditional source of ethics is religion and religious people derive their ethics from that single source; I am one of them. Of course, there is some latitude in the interpretation of Christian ethics, and I would imagine a similar latitude exists in other religions.
On occasion, a philosophical system replaces religion. Marxists for example derive their ethics from the perceived needs of the working class.
I don't think eclectic personal ethics are all that common.