10:1 is a continuing concerted effort to destroy the retail forex industry in the US. The whole idea of consumer protection is a ruse. It began with people saying 400:1 was too much. 400:1 was only offered on micro accounts (account value not to exceed $5,000 or $10,000 for GFT in old times) it quickly decreased as you went up. There was no danger of people blowing their whole retirement on 400:1 leverage.
Major currencies are more stable than major stocks. When you buy some british pounds you buy something of value, something with a stated value in UK, whereas when you buy google stock you buy a piece of paper and are not even entitled to a dividiend.
400:1 was important in allowing people to not have most of their capital tied up in "used margin". If you open a 100,000 unit position on a 1000 account you are not more safer if the broker requires you to put up 500 dollars for margin than if it requires you to put up 250 in fact since your usable margin just decreased the chance of a margin call increased tremendously making you LESS safe.
All of this would be a simple joke if not for a simple fact. Many UK brokers refuse to have US based clients (Forex.com UK is an exception) but forget about Alpari, GFT UK, etc.
FXCM treacherously lowered its margins for its UK branch too. It does affect trading. GBP based currency pairs are less attractive way more dangerous with the new 4.50 dollars per 1000 units margin than they were at 2.50 on FXCM UK.
For the time being, Forex.com UK offers 200:1 for mini and 100:1 with a good selection of currency pairs, but selection of good micro brokers with 400:1 across the board has been ruined.
CMS FX UK has 400:1 that is rapidly decreasing with order sizebut is missing key pairs such as GBP/NZD and GBP/CAD which is criminal.
http://www.cmsfx.co.uk/en/forex-trading-services/forex-trading-terms/margin-policy/