Well, the way Woodsing was originally intended, the age of the tree played a vital role.
The older the tree, the better the staff, and only petrified trees would create the perfect staff.
The idea behind this was of course to have players explore for petrified trees, and even protect the older trees against non magic-using players who might chop them down, not only for the timber and exp, but to prevent the magig-using classes from getting those perfect staffs. I think there was even a spell called WOODGUARD or something, which would place a high level mob at the tree, attecking whoever used the lumberjack command in the room.
If it doesn't work like this any more, the code is broken and should be mended.
It was a very cool feature and I'd like it back as intended.
Both the age of the tree and the level and skill of the caster should matter for the multiplyer.