Gotta say that you make a very good point.  Harvest might sound too harsh for some and sacrifice, IMO, puts a human quality to an animal that it shouldn't/doesn't have.  That animal did not make a choice.  That being said, certainly appreciating the fact that one has good meat to sell to others isn't a bad thing.  Thanking the animal prior to slaughter though seems absolutely silly to me.  But, hey, if that makes the consumer feel better.....