I suspect a ‘scale thing’ is involved with me. I never went for many limbers in 28mm, as the part of the battle being played/modelled is ususally not where artillery move about much.
With 6mm, for me, it is not that it lends itself to diorama so much, as the scale of game involves more of the grand tactical manoeuvre – batteries are moving into position and repositioning (we hope as our victorious forces press on
– or help cover a crushing defeat
), and you need limbers.
But I am not sure that excuses my laziness in not having 15mm, 10mm or in the past, 2mm limbers!
