You can have a shrewd idea yes of course. For example Man Utd at home you would expect over 2.5 goals pretty much every game if you go on the basis that Utd will always score 2/3 and are likely to concede 1. Same for Barcelona over 3.5 I'd imagine out of 38 games maybe 25/30 would be over 3.5. That'd still leave 8/13 under which is quite a high percentage.
Take Dayos bet yesterday. He had over 4.5 in the Everton game but it could've quite easily been 2-0 or even 1-0. It's all luck you've just gotta hope you pick the right games.
On sat/sun there were I think 9 games. 2 finished 1-0, Malaga and Sevillas games, the rest were all over 3.5 bar one which finished 2-1 iirc. I bet a double on the 2 games which finished 1-0 for over 2.5!! What are the chances?? Bad luck nothing more. I then did a £35 single on the Sevilla match, when the first leg of the double went down, on over 1.5 goals at 4/6 and it ended 1-0 also!! Incredible. In hindsight I should've waited til Sundays matches featuring Real and Barcelona.
I've studied form, history the lot mate. I've sat there for 2 hours on a Saturday morning looking at all the teams who have scored and conceded in a lot of their games lately. £100 treble on to return £300 both teams to score when all 6 teams involved have scored and conceded in their last 3/4 matches and the games have finished 0-0, 1-0 and 2-0.
Just gotta be lucky.