Say punting cashflow is $1000.. Then one unit is $20.
Professional punters will never bet over 5 Units. Betting $2500 is like having a $50K betting accounting. WOW!
I started off on $20 bets now I'm betting $500 as the norm. My bank roll is around $30K. I win 1 in every 3 bets. This may sound like a bad track record but I'm normally chasing 12 to 1 odds.