How can super fast trades be possible?

I sometime saw several trading systems on which most trades lasted less than 2 seconds. These systems are usually the EAa that are advertised on forums to attract buyers, and they have massive profits, like more than 2% per day. I know that what scalping is. But can someone explain to me how such trading style is allowed by brokers?

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More on this!
http://www.forexfactory.com/showthread.php?t=417334


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EA's that boast massive profits to entice the unsuspecting new-comer into buying their awesome system are likely a fake.

These "2 second" trades that an EA makes tons of demo profits are not useful on a real account.

All they do is take off quote trades that are closed immediately for a pip (+/-). This is not possible when real money is on the line.

Do not buy one of these fake demo EA's. They always get kicked out of the demo contests because they dont trade real quotes

Edit> Disclaimer>>> I don't know specifically what EA or broker you are referring to so I speak in general, very suspicious, terms

thank you for the reply. Can you explain more?

I saw several EAs on myfxbook that have even faster trades ( lasted 1second only) but they ( the EA sellers) boast that the account is real instead of demo. So how can they set up such a scam?

I truly don't know.

If the idea is that they sell you an EA and you turn it on and you get yourself rich...... it's not too likely

Open a 1 second chart (if your charting software allows), now tell me how many opportunities you have to make positive returns opening and closing a trade in 1 second...

IE. how many times does price move your brokers spread amount + more for positive returns in 1 second?

My guess is not many, and if there are, the sheer amount of trades it will be shooting out to make any decent return will be mind blowing... plus you'd need PERFECT execution timing and liquidity to do it, otherwise it will result in a losing trade... any sort of lag in executing the trade (on the brokers end or yours) would also result in a losing trade.. Please don't waste your money on these EA's that won't work