You still need another Credit card? -Find Out why you don't need even one

Lets say you work for a small private bank, and you take charge of two small branches within the town with a total of six salesmen: salesman 1, 2 and  3 in branch A and salesman 4, 5 and 6 in in Branch B.

On average salesman 1 sells one credit card weekly, salesman 2 sells two credit cards weekly and so on up to the top salesman who shifts 6 credit cards weekly. With a little calculation you know that Branch A sells averagely two credit cards per person weekly, and Branch B is far ahead with each salesman doing averagely five credit card weekly. You decide to move salesman 4 to Branch A and salesman 1 to Branch B, you find that the average sales of Branch A has increased to 2.5 whereas Branch B now has only two salesmen.

The above experiment tends to improve the overall outlook for Branch A without really bringing in any new clientèle for Branch A. Its safe to think that both the banks and and their customers have either maintained their population over the past three or four years, or there has been minimal change in numbers, however the banks need to realize their profits through interests rates from the increased debt. Having a credit card is like a silver bullet for a distant payment and hassle free shopping. There is something the bank never told us however apart from encouraging us to spend the money we haven't earned yet:-

1) High Interest Rates:

Your savings account may pay you around 2% interest monthly. If you have a loan from the bank then you may pay them up to 10 % interest which is five times as much as you earn off your savings. If you owe money to credit card you may pay them an interest of up to 20%, this is ten times as much as you earn off your savings. I used to think that nothing that grow exponentially grows forever, it has to reach some limit eventually. This statement has been true until I began to expand my mathematical problem above.

2) Blown Budget:

Am a best friend to my good friend. We faithfully buy at-least three pieces of something we don't need each month after which we then go to buy the things that we need in credit. I came up with an expenditure confessions and testimonials corner in my house which was initially created for personal use. I was surprised when I had visitors that at one time someone's entire salary had literally been reduced to three pairs of stilettos. That confession is the realest explanation of a blown budget.

3) Credit Card Fraud:

This story is top secret. 
Someone authorized a huge transaction from his credit card somewhere in Europe while he was in one of the Middle East airports just about to fly to some African country. While airborne he emailed his bank reporting theft of his credit card. This is it, the bank may or may not charge him for purchases made by someone else. This story is worth knowing its end.

4) Protection of Purchases:

Is there something like insurance on purchases? Imagine the kings son has bought a lion pet, three months down the line the lion pet breaks and eats its keeper. What happens in such incidences, Is there chance to eliminate the animal and get refund?