Ya, man you shouldn't waste roaches. On every joint rolling site that I looked at, when I wanted to try a joint,(by hte way, joints suck) said SAVE YER ROACHES MAN!!!!!! they get mad resin on em, form all of the smoke and shit you know. Savin em is a really good idea.
Another good idea I read aboot somewhere, is to save your stmes up, until you have enough to fill a tea bag, and then fill the tea bag with the stems, and put it in a bottle of vodka, somewhere dark. Wait a couple of weeks, and then fetch the vodka. Drink and enjoy. I guess it lets hte THC out into the vodka, and so you have this nice drunk/high combo.