Another Steam Summer Sale is upon us, and the service's users have flocked to it, buying deeply discounted games all day, every day, for over a week. It's become a cliche online -- Steam sales mean empty wallets. People buy dozens of games because they're cheap, even if they know they'll never play them.And that doesn't even consider the current Humble Bundle, running concurrently with Summer Games Done Quick -- just the latest in that site's aggregation of cheap games. The net effect? The most enthusiastic buyers have dozens of fresh, unplayed games.If our readers are any indication, the increasingly crowded Steam market and the huge numbers of discounted games are having an effect on purchasers.Earlier today, we asked our Twitter followers: What have you learned from the latest Steam sale? Most of those lessons seem to be hard ones.There's no doubt that many games -- games that are already popular, most likely -- are benefitting tremendously from the sale. But as has been widely discussed, getting onto Steam is no longer the golden ticket it once was, and that's reflected in these replies.Do you have any Steam Summer Sale stories? Have you learned any lessons? Share them in the comments below.