When Buy Get One Free isn't!

So I went to the local women's clothing store and purchased some new pants, shirts and got conned into buying some chunky jewellery - necklaces to be exact. The necklaces were buy get one free so I thought that isn't a bad deal and maybe, just maybe my wardrode could do with some chunky jewellery. Low and behold I overspent (those who know me know that this is a condition I have). So when I got home I pulled out all my clothes and went over the receipt again. Guess what? The Buy One Get One Free broke down like this - 1st Necklace $ 24.00 discounted to $ 14.00, 2nd necklace $ 22.00 discounted to $ 12.00. So I am a little stunned by this and do the math. At most this transaction should have cost me $ 24.00 ($24.00 and the second one free). And if they did do the 50% discount the first necklace would have cost $12.00 and the second $ 11.00 totalling $23.00. Instead I have paid $ 26.00 for the two necklaces. So me being a little bit of a conspiracy theorist thinks this is a really neat marketing tool. How many people would A) actually look at the receipt, B) Bother to do the math (at first glance it appears they 1/2 the cost or C) Return to the store for the total of $ 2.00. Needless to say not only did I take back the chunky (ugly) necklaces and get my money back but I also pointed out the math discrepancy. Of course the store can blame it on a till being programmed incorrectly but I wonder if this isn't just a great use of marketing strategy in order to plump up the bottom line in these tough economic times. Me - I am going to continue to check my receipts. I am already a nightmare for most of the cashiers. I see this as a game and watch for scanning discrepancies (meaning I get the same item for free) and things that are supposed to be on sale that aren't. I am also the woman who will make the cashiers write rain checks AND I use coupons when I can.