I am not a soccer punter but read this thread with interest. I have tried soccer but living in a country that doesn't allow in -play sports betting makes it difficult.
I trialled your theory with a minimum fav price of $1.68, ie. too short to bet in. I have no idea what <6.5 goals but I assume it's short so I used $1.02.
I used 4200 games on my database of EPL games. I did consecutive games, not waiting until the previous had ceased.
Using a $100 each game , including 5% commission, you did finish in front by +$2000 BUT you had long losing periods.
25Oct2003 to 20Mar2005
30Apr2005 to 27Aug2005
Since 17Apr 2006 you have been in profit, ending Apr2012. (end of database)
You lowest bank was -205 and your highest bank was 2100.
Seems it has potential.