I'm gonna take a wild guess: a. it costs a fortune for your main job, b. it costs a fortune for your /nin, c. you die alot solo (which is how you are probably gonna level your early levels), d. party leaders look for blm before they start looking for rng and there are plenty available, and e. rng damage gives TP but magic is generally safer.

Sucks, I love partying with rangers, although every once in a while I run across one with no concept of hate control; you get that from every job, but ranger has the tools to pull hate in 1-2 attacks and keep it for awhile, if they live long enough to keep it once they have the mob's attention.

Good advice from a range buddy of mine: get WW to 100 before you start the job and make friends with lots of other crafters. If you meet someone who's a good farmer it wouldn't hurt to be on good terms with them, too.