Not to sound ridiculous, but if you bet on 4-1 and lay the HT 1-1 I'll bet you the "value" will be even greater, no?
Think for just a second...how will you ever make money if you are going to lose 100% of your stake every time the game is 1-1 at HT? That will happen once every 11 games. Or will you chase the losses by laying the 2-1 again at half time every time the game is 1-1 after 45mins? Because I can guarantee you that will become an even bigger disaster after a proportionate amount of games.
You cannot find value by playing with different outcomes and math this way.
Oh and that 22 odd for 1-1 / 2-1 in the Barca Liverpool game is absolutely terrible value...you can find it at 40.0 as well.