The issue is as follows: In ﬁxed odds betting if a horse is 10/1 and you believe it to be a 9/1 shot to win the race you would stake £10. If it’s a 10/1 shot and you believe it to be an 8/1 shot you would stake £20, and so on. In spread betting this rule does not necessarily apply. Yes, grade your bets in a linear fashion depending on how far wrong the price is away from what you perceive it to be; however, always build in a ‘blow-up’ factor. Staking is a key factor in any betting and in particular spread betting.
By this I mean always ask yourself, does this bet have a possibility of going horribly wrong on me? For example, you might surmise that the total shirt numbers in a Chelsea v. Blackburn game is far too high at 32–35. If you made an aggressive sell at 32 you could of course be striking a brilliant bet. However, any number of scenarios beyond your control can occur; for example, a low numbered shirt is substituted/sent off/injured and replaced by a very high number shirt.
This can happen for several players and then you are staring down the barrel of a huge loss even though you made a sensible bet. These are the joys of unlimited liability betting but they are also the catalyst for higher rewards and high-adrenaline betting. Remember, the more right you are, the more you win.