to your edit:
that is not true. you can trade just the same and same leverage, instruments and securities without using any bookie and without much more money at hand. and the execution etc isnt any slower. even banks as your broker offer you the exact same (as advantage percieved) conditions like any bookie does- besides 24/5 trading (they offer only 14/5 trading)
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it just takes a bit more of knowledge of instruments available like, warrants- for example.
the only advantage of the bookies is that they support and finance websites like this one here which advertises the ease and the easy usage of the bookies to the people who are just starting out.
the comunities formed on such websites and the connected forum then do the advertisements for the bookies by themselves. -just remember how many posts there are asking "which broker should i use?" and the to it belonging always same answares of members who are trading with a bookie and arguing with others how good their bookie is.
but the truth is that no pro or semi-pro trader trades with any broker advertised on this webpage. the truth is that by the broker choise someone can tell how experienced of a trader someone else is.
the truth as well is that bucket broker are not needed, not even by the people who only have/want to invest $500/$1000 into the trading idea. they just found a good method to make momey on inexperience and are using their advertisement machine in very effective ways. add to it a fairly easy to use trading platform/program and a very easy way to open and close trades (idiot proved) and the newbie retail traders hook on them without even knowing that there are long lasting proved and fairly strongly regulated alternatives that do not act as your counterpart in trades.