Using weights instead of volumes in recipes is weird. You need cups to cook, but not a scale.
Using weights
Nitpick: grams are for mass*
And I've heard they do it because it is (arguably) more useful in evaluating nutritional value and hunger-satiation / stomach-filling power.
With Alicorn's permission, I'm resurrecting this thread.
I'll start off with one of my own: What kinds of exercise can I do at home (I do have 5- and 20-pound weights), and what are good ways to get motivation to do so regularly?