"to encourage direct debit."
It is a lot cheaper for eBay to debit your bank account (no fee to eBay) than to charge your credit card (eBay must pay processing fees of appx 1.3-1.5%).
I have always used my
US dollar denominated credit card (BMO Mastercard) to pay my monthly fees. I earn AirMiles on my credit card and get an extra month cash flow. With fees averaging more than US$1,000 a month, every little bit helps.
The credit card is usually billed 12 to 18 days after the end of the billing period.