This is a great question. I understand the philosophy of paying off debt, but not all debt is bad debt. I always want to use the Bank's money instead of my own. For example: If you have $100 to buy something with and you use all that money to pay for it, you have no more money but hopefully a cash flowing property. But you are limited to that one property until you have another $100. But, if you put $20 down and the bank provides you the remaining $80, and the property cash flows, not only do you have your own $80 to continue to buy properties, but you have someone paying that note in the form of a tenant, and you now have more than 1 appreciating asset that pays you every month.
This concept is the same when you use a credit card for business purposes. You are using the bank's money instead of your own. I know this has been a long winded post, but I hope it is helpful. Plus, you need a credit score to get a loan and credit cards help establish that. Good Luck out there!!!