Rose Immortal said:
I don't believe all offerings were burnt offerings, actually. I am pretty sure I read that at least some sacrifices were not burnt, but cooked and eaten.
Maybe these verses will help:
Leviticus 10:12-20
12 And Moses spake unto Aaron, and unto Eleazar and unto Ithamar, his sons that were left,
Take the meat offering that remaineth of the offerings of the LORD made by fire, and eat it without leaven beside the altar: for it is most holy: 13 And ye shall eat it in the holy place, because it is thy due, and thy sons' due, of the sacrifices of the LORD made by fire: for so I am commanded. 14 And the wave breast and heave shoulder shall ye eat in a clean place; thou, and thy sons, and thy daughters with thee: for they be thy due, and thy sons' due, which are given out of the sacrifices of peace offerings of the children of Israel. 15 The heave shoulder and the wave breast shall they bring with the offerings made by fire of the fat, to wave it for a wave offering before the LORD; and it shall be thine, and thy sons' with thee, by a statute for ever; as the LORD hath commanded. 16 And Moses diligently sought the goat of the sin offering, and, behold, it was burnt: and he was angry with Eleazar and Ithamar, the sons of Aaron which were left alive, saying, 17 Wherefore have ye not eaten the sin offering in the holy place, seeing it is most holy, and God hath given it you to bear the iniquity of the congregation, to make atonement for them before the LORD? 18 Behold, the blood of it was not brought in within the holy place: ye should indeed have eaten it in the holy place, as I commanded. 19 And Aaron said unto Moses, Behold, this day have they offered their sin offering and their burnt offering before the LORD; and such things have befallen me: and if I had eaten the sin offering to day, should it have been accepted in the sight of the LORD? 20 And when Moses heard that, he was content.
Ezekiel 42:13
Then said he unto me, The north chambers and the south chambers, which are before the separate place, they be holy chambers, where
the priests that approach unto the LORD shall eat the most holy things: there shall they lay the most holy things, and the meat offering, and the sin offering, and the trespass offering; for the place is holy.
Ezekiel 44:29
They shall eat the meat offering, and the sin offering, and the trespass offering; and every dedicated thing in Israel shall be theirs.
The offerings were eaten by the priests. After the food was ceremonially offered and "cooked", it was used by the priests and their families as part of their material support. That was one way the other tribes of Israel supported the priestly tribe.
See, God was not "wasteful".