That's what I figured, just can't understand why they don't have them with the same odds.
Well, I'm sure Mike or teeed will be able to provide a more sophisticated answer than me but I think, in large part, it's all about the eye test...
[TABLE="class: LineTable"]
<tbody>[TR="class: LHR"]
[TD="colspan: 5"]England Premier League - Saturday, December 28, 2013 10:00 AM[/TD]
[/TR]
[TR="class: LR NonAlt"]
[TD]17 Fulham (ENG-P)[/TD]
[TD]+½ -133[/TD]
[TD]
+278
[/TD]
[TD]Over 2½ +119[/TD]
[/TR]
[TR="class: LR NonAlt"]
[TD]18 Hull City (ENG-P)[/TD]
[TD]-½ +118[/TD]
[TD]
+122
[/TD]
[TD]Under 2½ -134[/TD]
[/TR]
[TR="class: LR NonAlt"]
[TD="colspan: 2"]Draw[/TD]
[TD]
+230
[/TD]
[TD][/TD]
[/TR]
</tbody>[/TABLE]
Which one are you naturally going to gravitate towards more, the option on the left, or the option on the right with the more enticing odds? Considering how much fuss people make about 5 cents here, 5 cents there, the majority of people are just naturally going to go for the greater odds. Plus, it's also in the book's best interest to entice people into betting the three way, because now you have three potential outcomes, as opposed to just the two with the AH (more opportunity for them to rake in funds). I think it also has to do with "theoretical hold", but that stuff's a little out of my knowledge base.