The sale of timber upon state forestland and state land within such sustained yield unit or units shall be made for not less than the appraised value thereof as heretofore provided for the sale of timber on state lands. However, if in the judgment of the department, it is to the best interests of the state to do so, the timber or any such sustained yield unit or units may be sold on a stumpage or scale basis for a price per thousand not less than the appraised value thereof. The department shall reserve the right to reject any and all bids if the intent of this chapter will not be carried out. Permanency of local communities and industries, prospects of fulfillment of contract requirements, and financial position of the bidder shall all be factors included in this decision.