Im sure that this has been said hundreds of times aswell. Snorting heroin is all well n good, but your asking if your wasting it by doing a bigger line as opposed to smaller ones - im not giving you advise really on what to do, but IMHO, i think that your wasting it by snorting it alltogether. Snorting boy will get you high for sure, but you will also build a quick tolerance to it, and find yourself doing two or three times more than you started off with in no time. I know that you probably swore that you would never shoot up, because most of us at one point or another have aswell drawn that line in the sand n said fuck that, ill never shoot up in my life, ever, but eventually the majority of us that have said that had resorted to using the needle. And theres one thing that is definitive - lets say your doing somethin like 2 or 3 20 bags right now to get off. If you go to the needle, it would take somethin like just a dimes worth of boy to fuck you up in a major way, reguardless of what your tolerance is from snorting it. It works in wierd ways for sure, but like i said, i personally think that snorting boy is just a waste of money.
Once again, i am NOT telling you to say fuck it, just go find a needle n start slamming, im just telling you about my own personal experience, and in no way condone IV drug use, especially with someone who has never used drugs IV before. I would rather see you quit doing heroin alltogether before you resort to stickin a rig in your arm.