Even though it was only 20, but I think I will be a little irked if I lost to someone and they didnt give me an opportunity to redeem myself.
This, IMHO, should speak volumes and in truth, I think you've actually answered your question. Do unto others as you would have them do unto you.
I think it's good etiquette and good business to at least give some indication that you will only play one or two sets. In the past I have posted at length about why I think it's bad for action in general and frankly, nitty to quit ahead without notice, but in this case I'd like to simply appeal to the desire for financial gain. If a player is known as one who doesn't give an opponent the opportunity to try and win back his money, how will he ever get anybody to lose more than two sets to him? Quitting ahead severely limits a player's ability to make money!
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