I am sorry, but I don't understand your question. What do you mean?
This will sound cynical, but that is far from my intent. I believe in God, and believe He holds mankind's best interest as prime. Sacrifice served many purposes. Let's say that this act of repentance truly did change an individual's life. The follow-up question is then why not have each individual perform his own sacrifice? Once answer might be, Because the individual sin had repercussions into the community, so the community deserved reparations from the cause of that sin. This leads us into the need for someone to gather the community and organize the event--i.e., the priests. Who is going to pay the priests? They can be paid with a portion of the sacrifice. We now have a portion of the sacrifice (blood on the altar, and fat, too, if I recall correctly); we have a portion going to the priests who organized and distributed; we have a portion of the sacrifice being returned to the one(s) repenting; and the rest is shared with the community. The sinner shows his repentance; the community accepts it; and now both sinner and community are going to expect improvement. Peace has been made.
It is easy to see how well this might work within small communities. What about large communities? More people, but then there are more sacrifices. Lots of food, lots of people, plenty of partying and likely the loss of expectation of improved behavior--especially when many do not know who is repenting of what. We also see plenty of opportunity for graft. (Oh, your animal has a "blemish", but we can sell you an "unblemished" one for a price; then they use the "blemished" animal as the trade for the next "blemished" animal.) Then, how about selling off (instead of distributing) some of the meat? More profit. Add to this natural gluttony of the people in the midst of plenty.
Expand this to an entire nation....It is easy to see why the idea of the Apocalypse formed hundreds of years before Jesus was ever born and Revelation was written. As good as human intent (or at least part of it) is, it always ends up in corruption. God, Himself, will have to establish His rule on earth. A rule steeped in goodness seems beyond the capability of mankind. We can only seem to maintain it for a short time (cosmically speaking). The greater the population, the more likely its collapse. Except for the fragment...this portion (was it 25%) starts over and it all begins again, ending with the same result.