Scaly piscine
Cricket Web: All-Time Legend
Yep.This is what I meant earlier. When you're not in a position that you likely won't need to bat again, isn't it going to be much easier to get the runs you need at 450-5 with two guys set at the crease against a bowling attack that's been in the field for ages, rather than with two openers against a fresh bowling attack?
And it's a freeroll too - you tell Hussey and Wade "your wickets don't matter, just try and get as many quick runs as you can". If they get out attacking, you're not really any worse off than if you had declared, but the upside is 50-100 quick runs that you then don't need in the 3rd innings, which will almost certainly be harder conditions to score.
It's not a big thing, and it'll affect the result of the Test a small %age of the time, but it's possible that Sri Lanka could bat the day out tomorrow, and (as you said) Australia having scored 27 runs in 4 overs rather than 14, would have given 10 more overs to try and get Sri Lanka out.
The 'small percentage' is part of the problem. People can't always perceive it. The sort of difference it makes is small because the games are typically not on the margins, they're not 50-50. In a 50-50 game one wicket, dropped catch, partnership makes a 50-50 game go 60-40 - that's a tangible difference. When one team is declaring they're usually dominant, when you're 90-95 percent chance to draw/win then an incident like those mentioned (or a crap declaration) has a small impact. Instead of say 95% to draw/win you could become 94% or 96%. So of those games you're losing, you would lose an extra 20% or 20% less, but when you're only losing 1 game in 20 to start with - it's barely noticeable. It is hard to tell between massively on top and slightly more/less massively on top (apart from easily comparable positions like 220 runs ahead is better than 200 runs ahead - but add in factors like overs remaining, probable run-rates, pitch breaking up, bowlers/batsmen injured, fatigue...)
This lack of perception means people are trying to use other things to judge, such as instinct or the end result. Which doesn't really work.