It again comes down to the parable of the sower
Luke 8 Authorized (King James) Version (AKJV)
15 But that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.
They know full well that "tithing" is not a new covenant requirement but they say it anyway.
John 10 Authorized (King James) Version (AKJV)
27 My sheep hear my voice, and I know them, and they follow me