 When interest on the credit card is added to the premium, it can become very expensive.For example, the cost of PPI for the average credit card in the UK charging 19.32% on an average of £5,000 each month adds an extra £3,219.88 in premiums and interest.With lump sum loans PPI premiums are paid upfront with the cost from 13% to 56% of the loan amount as reported by the Citizens Advice Bureau (CAB) who launched a Super Complaint into what it called the Protection Racket.