Basically it's called using money as a means to make money, and this was frowned upon in many civilisations. Even today, in much of the Muslim world they do not charge interest. They do have higher bank fees (no free accounts, no free checking or electronic transfers).
Keep in mind if we travelled back in time even 100 years ago, charging 29.9% interest would be far beyond the limit of usury.
Today in the western world, we accept the idea of being able simply move around money as a career that is beneficial to society, versus simply using money for trade and exchange. I really think this is one of the worst things we could have accepted as being morally acceptable. Board executives at JPMorgan Chase, PNC and the other banks that caused so much destruction in 2008 should have been thrown in jail next to rapists, paedophiles and murders. Instead they destroyed thousands of lives and made off with millions in bonuses.