What affects credit card rates?

What affects the rate a merchant pays for a credit card?

Factors that determine your rates include:
1) The industry your business is engaged in.
2) The general level risk for that type of business
3) The business's/industry's history of chargebacks
4) The individual businesses processing history
5) The business's and the owner' credit history
6) The time to deliver of the goods
7) The type of card accepted (debit, simple credit, rewards credit, corporate credit, etc.)
8) The way the card is accepted (swipped, keyed present, keyed not present, etc.)

There are other items to consider, but these are the main factors.