In computing tax there may be deducted from the measure of tax amounts derived from bona fide (1) initiation fees, (2) dues, (3) contributions, (4) donations, (5) tuition fees, (6) charges made by a nonprofit trade or professional organization for attending or occupying space at a trade show, convention, or educational seminar sponsored by the nonprofit trade or professional organization, which trade show, convention, or educational seminar is not open to the general public, (7) charges made for operation of privately operated kindergartens, and (8) endowment funds. This section may not be construed to exempt any person, association, or society from tax liability upon selling tangible personal property, digital goods, digital codes, or digital automated services, or upon providing facilities or other services for which a special charge is made to members or others. If dues are in exchange for any significant amount of goods or services rendered by the recipient thereof to members without any additional charge to the member, or if the dues are graduated upon the amount of goods or services rendered, the value of such goods or services shall not be considered as a deduction under this section.