Look at it like this. Let’s take an eight game accumulator, where each selection is even money (double your money for a single bet) with the absolute best price on the internet or on the exchanges (Betfair etc). Assuming this is a realistic possibility of the teams winning, that would mean the correct odds of return should be 2x2x2x2x2x2x2x2 = 256 or 255/1 for all eight of the teams winning.
Given the margin that Ladbrokes usually bet to, in-store each of these games would average 4/5 (or 0.8/1). Therefore applying the same calculation to these odds would mean 1.8×1.8×1.8×1.8×1.8×1.8×1.8×1.8 = 110 or 109/1. It doesn’t matter whether you’re referring to 1/3 shots or 7/2 shots. The maths, and the bookies’ margin, is still the same.
This example isn’t exclusive to Ladbrokes. All bookmakers who run accumulators will run to a margin. Most in-store bookies are approximately ten per cent margin per game, with online approximately seven per cent per game.
Those that ready my August article (The Beginners Guide to Betting) will be aware how lucrative even a three per cent margin can be for the house. In this example, it is over 100 per cent.
There are alternative ways to put football accumulators on, with better margins, but the concept is still the same. The more teams you put in, the more meaty you make the bookies margin.
Give yourself a chance. Shop around, find your absolute best bet at the best price and stick to singles and doubles. You’ll be better off in the long term.