Also, a proposed solution in regards to "How to be Altruistic" (in a way that DOESN'T make you feel like you've "been good enough that they've earned the right to be a little selfish.")

I think that the best way to avoid this pitfall is to incorporate whatever altruism that you want to do into your way of life, so that it doesn't feel like a one-time shot.

Example- Instead of donating a lump sum of $50 to the charity of your choice, see if there's a way to have a $1 donation made automatically every week.

Vegetarianism is another example. Once you actually become a vegetarian you don't feel like you're doing any further good just by continuing to do what you always do.

I don't have any evidence for it, just personal experience.