Re: Line Value question
I'd say it depends on how long the opening line stayed where it did. If the opening line (or something close) is available for a long time, then by the time it changes 1.5 points or so that makes it a bad number to bet at that point. If it changes very quickly to be worse for you upon opening, then I'd say the closing line dictates more about the value and your numbers would be good.
I feel the moral of the story is that not everyone can bet the absolute opening line on a game or maybe you have to wait on evaluating further info before deciding and willing to miss a bit of value in exchange for that, but everyone should have a fair chance of getting to beat the closing line so there's less excuses with that.
Good examples with this happen during football season when the numbers for the following week get put on the board Sunday night. They can change in the blink of an eye and I've usually not felt bad missing out on a quick line move because maybe I want to wait until mid-week for the injury report or maybe I think the line could move the other way by the weekend. Maybe it's worth a half point or point to not have my money sucked up for a whole week trying to take a chance betting a game very early which could end up a disaster with even one bit of news, or the Vegas tourist money rolls in, or whatever, and the line could move the other way. In basketball, it's more about hours as opposed to days but it's the same basic idea.
It also depends on the numbers themselves. If Duke opens at -20 and instantly moves up to -20.5, it's lost value but anyone wanting the play probably won't worry much about it. A lot different if a low scoring smashmouth Big East game where every point is golden moves from -2 to -2.5, etc. Or if it's the NFL and a line goes from -2.5 to -3, etc.
The numbers you gave certainly seem pretty key so you will probably get half of the people saying that it's a lot of lost value and half saying that you're alright because you did better than the closing line. As I've said though, I think the answer could lie in how long the better opening numbers were up and whether it was worth tying up your money for those extra hours to act then and take them without perhaps waiting for the most key later information on the game, etc.