The Judge of the District Court of Macon County shall receive an annual expense allowance of not more than five thousand dollars ($5,000), payable in equal monthly installments from the general fund of the county. The expense allowance hereinabove provided for shall be the only expense allowance payable to such judge out of the county treasury of Macon County. Provided, however, that the implementation of this section shall be completely discretionary with the county commission.