Since these are of no account, I don't really care what the Catholics say about indulgences/good/charitable works and their effects. The wares bought and sold during the time were for remittance of sin. Luther complained that if the money could remove someone from purgatory, why didn't the Church do it for free for everyone. Because debts needed paying, basilicas needed building and profit must be made off the rich and poor faithful in their ignorance.
Indulgences have nothing to do with forgiveness. You can keep repeating that falsehood until you are blue in the face, but indulgences cannot be understood in any sense to bring forgiveness of sins.