But there's a difference there. Punters who bet in a bookie's or similar establisment are betting on non-random events. Some horses, or football teams or whatever, are better than others.
No they
are random. I don't know whether you're referring to normal football or American football, but let me talk about normal football.
We know that on average (mean) the respective number of times the home team wins is 45.7%, a draw 27.6% and an away win 26.6%. We also know the average score is 1.51 -- 1.11.
Now this means that given a sufficiently large number of diifferent teams all playing each other over a sufficiently large number of times, then the number of times there will be a home win, draw, away win will be 45.7% -- 27.6% -- 26.6% of the time with an average score of 1.51 -- 1.11.
But this is exactly the same as saying the chance of each of the numbers of a tossed dice coming up is 16.7% (i.e 1/6th).
Now for each match you can obtain the odds which the bookies reckon is the real chance of each of the respective teams winning and by how many goals (although you need to take into account their over-round). For example the bookies reckon that tonight's match between QPR and Coventry is 44.5% -- 29.1% -- 26.5%. But this may not be the
true probability, but merely the bookies estimation of the true probability. People like the guy you know might be able to estimate the true probability more closely than the bookies. Maybe the
true probability is 50 -- 30 -- 20. But whatever,
it is still a random event.
It is possible by studying the form and conditions to make predictions about which horses or football teams are more likely to win than their odds suggest. I know someone who does this: he's retired, and spends most of his time figuring out what to bet on, as far as I can tell. He makes a very modest profit.
Yes it is possible. It is what I have been attempting to do by betting on correct scores in the England premiership since the start of this season. I'm down by £4.26 having bet £1128.31 which have lost, and £1124.05 which have won (of course without the commission I would be £51 up). So it's not working
so far although it seems to me I have, on occasions, been extraordinarily unlucky. I was thinking about starting to bet on the asian handicap in football as well as there is only 1% taken in commission.
But I digress. Let's suppose for the sake of argument that the bookies
always accurately gives the correct probability. Thus in the bookies you would necessarily lose in the long run.
But this is not necessarily so in a betting exchange such as betfair. It's p2p betting. The guys who run the site simply take a 5% cut of all winnings. Particular individuals can put up odds which someone else can accept. Lets say you want to back an outcome as opposed to laying it.
You can ensure a profit by only putting up odds whcih exceed the true odds. If another punter accepts those odds then in the long run you are guaranteed a profit. Of course it might the case that no one will accept your odds. But, as in the lottery, you're relying upon other peoples' misunderstanding of what represents good value (or you're relying upon the notion that people don't particular care whether a bet represents good value, they're doing it for the thrill of the bet).