Over here in the UK 9/32 shafts in pine are used quite a lot, but generally only on bows up to about 35-40lb draw weight because of the shaft's spine. They are quite popular with archers who shoot long target shots as they make reaching the boss (80 or 100 yards etc) much more straightforward. We also see 1/4" shafts for low poundage bows. Pine shafts in these diameters are pretty whippy though, and not at all suited to fast bows or higher draw weight bows.