I like this... "one man's stop loss is another man's take profit" (x4x)!
I agree with most of what has already been said but what hasn't been mentioned yet is that the brokers aren't stupid. In most firm's terms and conditions it clearly states that they have the right to pass your trade onto the market at any time. If you flag up with them as someone who knows how to trade it won't be long before they start regularly passing on your trades to the market. I've been trading forex for a good 5 years now and I have realised a few things.
When you trade forex with an ecn broker you regularly experience slippage. This is because they can only pass on trades in blocks of 1 full lot. If they can't pass your trade on due to low liquidity then your trade will experience slippage whether it is your stop/limit order or take profit/stop loss.
Now, when you trade with an "stp" (straight through processing) broker who claim to pass your trade on direct to the market you rarely experience slippage unless there is a gap due to a news item, etc.
The interesting thing is that when you start to make money with an stp broker you suddenly find that you are experiencing slippage. Why? This is obviously because once you are flagged as a profitable trader they start to pass your trades on to the market. The same problem occurs as with an ecn broker and they can't pass your trade on immediately all the time as they have to trade in blocks of 1 full lot.
This has happened too many times to be a coincidence and with too many brokers and what it obviously means is that they are NOT passing your trades on "stp" at all unless they consider you a threat to their profits. In this way they are actually behaving exactly as a "market maker" or spread betting company.
How does this relate to spread betting and this article? Well, I have only just started spread betting after having traded forex for just over 5 years but the big difference that I can see is that the spread betting companies are all pretty much upfront about what's going on. You are betting directly against them but if they don't like the look of you or your bet then they can simply hedge off your trades with the wider market and still make good money on the extra spread you are paying. This sounds and feels to me exactly like a traditional book maker although there is plenty of anecdotal evidence of people being turned away for good from betting establishments if they were found to be making too much money. Even today online bookmakers have been known to ban people if they made too much money.
At the present moment I can't say whether the same slippage and other problems will occur if you are profitable with a spread betting company. Presumably I'll find out soon enough but for the meantime I'm getting a good service from my broker and that's all I care about.
By the way, if I ever experience any problems that feel like price manipulation or problems closing trades when in profit, etc then I simply shut down the account and never look back, no questions asked. There are so many half decent companies out there that there is no need to indulge the shoddy ones.
As for the pay to learn companies, I can't comment from experience but it's true to say that everything you need to know is available for free in public forums so £13,000 for anything sounds a lot of money.
I hope this brings a fresh perspective on the issues brought up in the article?