The bad pricing is not because of technology, it's intentional on the part of the retail forex broker to give their customers the worst possible prices so the broker makes more money. A retail broker could easily run a fair shop where they base their bid and ask on the EBS bid and ask (but wider), fully hedge their overall position, and make their profit from the spread only. Given that every retail forex platform that I have used or read about in this and other forums seems to have chosen to screw their customers, it is hard to feel any sympathy for them. Keep in mind that the only reason that the scalpers can make money arbing the broker and the spot price is that the broker's price is out of line because they are busy sticking it to their customers.