Accumulator betting is generally a terrible idea. There are some exceptions to this rule, but 9 times out of 10 you should run a million miles from accumulator betting. The reasons are simple. Your hunch bet, which on average is losing 10% of your stake every bet, compounded with another 3 hunch bets, is actually making you lose on average 34% of your stake.
For example, let’s say you place a £10 on a 4 leg accumulator at 60 in odds. The bookmaker is essentially saying this will happen 1 time every 60 times. However, you should be getting odds of 91 (average payback at 90% giving 0.9^4 = 0.6561, 60/0.6561 = 91.45). That means the bookmaker has an edge of 34% over you.
Doesn’t sound very fair does it? That’s why bookmakers are spending millions on advertising accumulators