It certainly is a waste to take Heroin by the oral route, but in my experience, it's not a colossal waste like some people make it out to be. It ended up being about as potent as it was supposed to be. My experience only consisted of making up a half-gram shot or so, then getting hassled in the bathroom. I was afraid I was gonna get popped so I just ate everything in site. It got me well, just as a shot would have, but it was definitely a fraction of the potency.
It's not economically feasible for most people and admittedly, I only tried it because I was afraid of the law, but I don't think it should be completely ruled out as an ROA, especially for totally new users. At any rate, the use of ROA's like rectal are a great way to divert folks from the needle, as it gives a decent BA and can actually provide something vaguely resembling a rush.