There's no denomination or sect that actually tithes 10% on average. There was a freakonomics episode about it. There was as researcher who found that certain donominations tithe more or less but none reached 10%.
This 1980 statement from the church is an interesting one and the sentiment seems to me mostly unchanged from my admittedly outside viewpoint. https://www.lds.org/study/ensign/1980/06/concerning-tithing?...