I'll introduce myself properly later, but I wanted to get this topic up as soon as possible.
1000 simpoints cost ten dollars. In the sims store this is converted to seven euros. However, when you want to buy them through Origin, you have to pay... ten euros!
I e-mailed EA and posted on their forum. They mailed me back, stating that the dollarprice was converted 1:1 because some users have been 'cheating' by using cheap east-European prices... or something. It was all very vague. They also deleted my topic on the forums. Hmm...
Prices for games and expansion packs are, as far as I can tell, still converted properly. But when you want to buy Simpoints, it is better to stay away from Origin and use the Sims 3 Store instead.
A special hint to Dutch users: Origin was the only way we could pay through the populair method of iDeal. However, Paypal recently launched a service called Money2 that enables us Dutchies to activate as well as transfer money to our Paypal account, using iDeal and at no extra fee. Instead of two to three working days, activating and adding money can now be done within minutes. Take
that, Origin!
P.S. Make sure to register your Origin-bought expansion packs BEFORE you complete the download! Otherwise the DRM will do it for you, denying you of free welcoming downloads and a shiny new icon on your account page. Look here for more details.
http://forum.thesims3.com/jforum/posts/list/566988.pageEdit: it seems that some of the stuff packs like "Fast lane" are converted 1:1 as well. Before you pay way too much, make sure to swich language settings and make sure you are paying a fair price.