Every successful punter I know uses a Betting Bank. It is impossible to know if we are really winning or even how much we are winning without it. Punters tend to forget their losses and over play their winnings. A betting bank is a measure of your success (or failure) at betting.
A betting bank is a sum of money we put to one side (money which we can afford to lose) and is used exclusively for our betting. It can be as big or as small as we like.
A betting bank can be used in a number of ways. A popular method is to divide it into points. So a 20 point bank at £5 a point would be a betting bank of £100. Another method is to use a percentage of our betting bank for each bet. So if we had a £100 betting bank and we were using 5% of our betting bank then each bet would simply be the amount in our betting bank times 5%.
Of the two methods I much prefer the first. With this method our stake remains constant and is sometimes known as level stake betting. We can choose to recalculate our stake at whatever point we like. Personally I tend to recalculate my stakes when the betting bank has grown by 25% or more.