I am sorry for the misinformation given by the Moderators here, let me clear things up.
Yes, you are correct, we did made changes to our subs to reflect a single currency, (Euros) in this case and went for a simplified pricing table for about 6 months ago, while slighty increasing our prices to match prices in the Market in this industry.
Now you did as a matter of fact bought 6 months of SoT back then. Which was 37 Dollars at that time and you used 25% off coupon which landed you to the price you paid for. That is why you got youself a good deal.
Now the 6 Month pricing is 45 Euros for SoT which would be about 53 Dollars, if you were to use a 25% off like you did before you would land around 40 Dollars.
You are talking about buying a cheat for 6 months of use and we belive these prices are fair at this time in this Market.
Its up to you to buy it or not but i can tell you they are here to stay and won't be changed.
Hope this cleared up the situation. Now it's up to you to decide ^^