If at any time during our time together you find yourself in any situation where you are neither learning nor contributing, use your two feet. Go to some other place where you may learn and contribute.

via Wikipedia

Basically, you’re only as good to me as what I can contribute or get out of you. It’s a pretty businesslike perspective but I think it applies really well to websites we visit or any place we spend a lot of time.

It shouldn’t be applied to relationships though. Selflessness is a virtue.