Economies of scale come in many shapes and forms, savings in terms of office space if both have more space than they require and they can be contained on one floor. Savings in terms of costs of exchange connections, IT hardware, IT staffing and of course a combined unit is in a much stonger position to get lower clearing rates etc.
Segregation is the most abused and misunderstood concept, I am amazed how many people seem to be totally mislead by segregation, sometimes deliberately.
Firstly the ONLY security you have is the balance sheet of the company you are directly contracting with. There are trading rooms that make great play of the fact they hold funds with big banks and clearing institutions, that is of no benefit to you as a trader.
For example say a trading room ABC is a prop trading outfit, not FSA regulated and therefore cannot hold client money, they clear for example Fortis, they have twenty traders and they go down with losses of £ 1 million, Fortis are obligated by the FSA to protect all their other clients from any losses from ABC, but the traders at ABC have no recourse whatsoever. So if you were a trader with £ 50,000 on your account you are done for, as far as the liquidators are concerned all the money is owned by the company and will go towards paying off debts.
Now then same scenario but this time ABC is a regulated company holding client money and each trader is segregated, again clearing Fortis and again they go down with £ 1 million losses. This time the clients have some measure of protection but only in so far as ABC has to make good the losses to the segregated traders to the balance sheet of the company (ABC) and this will take time for FSA to sort out, in the meantime your money is untouchable. Let’s say after the sale of all the assets there is still a loss but the traders are able to recover £ 0.60 in the pound. This is what happened at Griffin. Again none of the traders at ABC will have any recourse to Fortis whose sole responsibility is to make sure the failure of ABC does not effect any of their other customers.
The basics are this, make sure you only sign up to an FSA registered company as this means the balance sheet and company structure meets minimum FSA standards, make sure the company has a good strong balance sheet as this is your only real protection and then remember the basic rule of economics, you get what you get what you pay for. If you want to go to a bucket shop with a poor balance sheet because it saves you £ 0 02 per lot commission then you probably deserve everything you get if they are one of the companies that fold.
There are more than a few trading rooms with very poor balance sheets and some that are not FSA registered but offer very cheap commissions and huge leverage, they will blow up sooner or latter.