The determinations of the board as to a contribution’s accorded value under s. 193.701 (3) (a) and the fairness to the cooperative of a contribution and any terms of payment or performance applicable to the contribution, the terms of any contribution agreement under s. 193.711, and the terms of any contribution rights agreement under s. 193.715 are presumed to be proper if the determinations are made in good faith and on the basis of methods that are reasonable under the circumstances. Directors who are present and entitled to vote, and who, intentionally or without reasonable investigation, fail to vote against approving a consideration that is unfair to the cooperative, or who overvalue property or services received or to be received by the cooperative as a contribution, are jointly and severally liable to the cooperative for the benefit of the members then existing who did not consent to and are damaged by the consideration or overvaluing of property or services, to the extent of the damages to those members. A director against whom a claim is asserted pursuant to this section, except in a case of knowing participation in a deliberate fraud, is entitled to contribution on an equitable basis from other directors who are liable under this section.