lotsa - If buyers want to purchase more with immediate pay set up, they simply add to cart then do one payment.

If they don't pay, they haven't made the purchase yet, it just sits in their cart as a reminder to buy.

Not sure if you can bulk edit that option but I would imagine you can.

http://pages.ebay.com.au/help/pay/require-immediate-payment.html

mc dollar - It's 2 or more strikes within 12 months that you can have set on your account.

Set up your blocks if you haven't.

Having it recorded or a symbol on the account is not going to help if a buyer clicks BIN or bids in the last few minutes not giving you the opportunity to look at the account and retract a bid. That's why the strike system works and the more sellers that open unpaid cases, the more non payers will get the message. No pay, No more ebaying.