In reply to sheffieldchris: I'll sell you some
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http://www.ukclimbing.com/forums/t.php?n=602191
I've used them previously in Peru and found them useful. They probably would have been very good last season in Scotland. More generally, I'm not sure.
I guess the reasoning is partly that in most years there is not reliably a large depth of snow in Scotland and not that many routes where multiple snow anchors are needed. There has also been some testing that shows that whilst offering some decent holding power in firm snow, they are no different from other snow anchors in often proving less than ideal.
However, there is also the issue of familiarity and fashion - climbers tend to stick with what they are familiar with or they follow whatever the latest trend in gear is. Snow stakes are not 'familiar' to most UK climbers and have never been fashionable. That probably helps explains there relative absence rather than them being intrinsically not suitable.
I am interested to see what others think.