Yes and no, in a way, you will gain using shwag making oil. If you start out with lets say 28g's of shwag, you make oil, you should end up with about 10-14g's of oil. If you look at it this way, you may lose some grams, but those compressed grams in that oil, will take only about 2 rips to get you stoned, instead of smoking 2 fat joints to get a buzz.

So in a way, you will end up with same amount of smoke, it will just be more compressed and much more potent. It just makes it a more pleasure to smoke rather than having to light up dirt weed, with a bad taste, and a headache to follow.

For myself though, quality over quantity. I'd buy 7g's of nice Blueberry herb before I bought an ounce of dirt weed. With the dirt weed, you have to bust it all up, soak the oil, evap. it. Not too mention smoking oil is not as simple as just lightng up a good joint. It's messy, sticky shit.