Don't go nil with four spades

Ok so I play a fair amount of spades on the net. It comes with XP I like it as it's always available for a couple of quick hands. There are people speaking all sorts of languages playing it. It's a fine example of Microsoft's ability at localization. But the people playing expert level aren't always the best.

What's the point of going nil with 4 spades. There are only 13 of them in a deck and if things balance out then on average if you have four spades even four lousy spades you're gonna take a trick. I mean sure it's been done and it's not like someone's life depends on it... as far as you know. But if someone's gonna play expert level they could at least play as though they understood the odds.

Or maybe they just lost focus.

When playing backgammon if you're way behind and someone doubles take the chance to resign rather than playing on and losing twice what you would have lost if you didn't accept the double.