IanM: I don't think they will really care about exploits that encourage people to hand over money at the intended selling prices
Not sure how much it really matters - if you "game" the system to get something you want today and do it again in the next couple of days, you're just condensing the time frame within you would buy the games you want.
I mean look at the lists in the OP of the Daily Personal Deals tracker thread - obviously the pool of games in the Daily Surprise deals is not infinite, so after a few reshuffles you'd have all the games you want from that pool and you'd be done.
Unless someone wants so many games that the time left till the sale is over is not enough?