Credit cards are revolving accounts, which means you can revolve a balance from month to month as part of the terms of the agreement. And even if you pay off the balance, the account stays open. A credit card with a zero balance (or a very low balance) and a high credit limit is very good for your credit score.
No-reserve auction. A No-reserve auction (NR), also known as an absolute auction, is an auction in which the item for sale will be sold regardless of price. From the seller's perspective, advertising an auction as having no reserve price can be desirable because it potentially attracts a greater number of bidders due to the possibility of a bargain.
I will assume that you mean (as an example) a no reserve auction that has an opening bid of $10,000. In this example the seller has set his reserve at 10K. The terms of this auction are controlled by the seller. The seller can set up almost any rules they want and call it terms of sale.