Before reading, keep in mind that this is not some get rich quick scheme. I make some extra income each month with it, though I'm sure if you take this serious, it's possible to use this as your main income source.
I'll write a short guide:
There are many online sportsbooks who are offering sing-up promotions to attract new customers and it's possible to take advantage of this by using technique called Matched Betting.
Although it includes a word "betting" there is absolutely no risk involved like it's usually with betting.
The idea of Matched Betting is that you visit as many online bookies as possible and collect every singup promotion.
But it's not possible to just cash out these promotions, as they are restricted by withdrawing rules or terms, such as: bet X times to withdraw the bonus. So if you just bet in hopes of clearing the restrictions, it's likely that you'll lose your bonus and even deposited money.
Solution to this is actually quite simple: just bet on two opposite outcomes in two sportsbooks, by doing so you can't win or lose anything, but you can still fulfill withdrawing requirements. Make a few bets and promotion is yours.
If you use betting exchange as one sportsbook, you don't need to fulfill withdrawing restrictions every time you visit a sportsbook, as you can use it for clearing all sing-up offers.
You can read more about this here:
http://www.nrbetting.comHave any questions? Feel free to ask!