If you mean giving free stuff--yes, it is. I sometimes purchase things purposely to list on auction so that I can get more credits to trade for other things here on Listia. I like to also clear my home of things I no longer need and by listing them, I get more credits:) The only thing though is someone has to pay for the shipping--that's either the seller offers 'free shipping' or the winner has to pay. I hope I've answered your question.
After your auction ends, check it. Listia will be providing you an address of the winner or you will have to request it from the winner if no address is provided. The credits your auction won will automatically transfer to you. Check out the Listia tutorial if you haven't done so yet. I learned as I just listed items and won some:)