I hope you all don't mind, but I've copy & pasted the bulk of this from my lodestone blog:
"I don't understand the mechanics of getting guild marks from local guildleves which drop off to camps as yet.
However, I think I've finally cottoned on to how the in town local guildleves determine guild mark rewards.
Ever noticed the snarky little "don't wander too far" and "this is important, craft it quick" type messages you get from the local guildleve NPCs?
So I've been aiming for local leves that are within 5 ranks of my job - eg leather is currently rank 17 - so I'll look for rank 15 or 20 leves. Mainly because I want those guild marks!!
The last few of these town leves I've ensured I've gotten the necessary guild support beforehand. Then once I've picked up the mats from the NPC I synth the required items right then & there. Every single time so far I've received guild marks as a reward.
I must not be the only person who thinks this works as you tend to see a number of other adventurers grabbing the cobble stones around the NPCs too ^^.
Even if others have already worked this out, I know I've had a difficult time trying to work it out myself and the information available is a bit sparse, so I'm putting this up in case it helps anyone else.
If anyone should read this and have their own thoughts on the above, or otherwise if you have a theory on getting guild marks from the camp drops, I'd be glad to hear from you 8D
PS - While the Dev post of 3/12/2010 on the lodestone talks specifically about factions leves - notice the little red circles? There's no reason why this same localisation might not occur for the local guildleves as well...."
Just wanted to say - because the guildleves I target tend to be within 5 ranks above or below I normally don't get appraised higher than 50 (higher than 20 even), yet the above has still held true.
As mentioned above I don't understand the camp drops - on some i've synthed at the camp & gotten no marks; on some I've synthed with support in the city and kept wearing the same job out to the camp only to get .. no marks; and yet I swear that on others I've completed the synth in city and travelled to the camp wearing my fisher for Quick use and yet got the drop. I'm wondering whether the camp drop is a function of time between pick up and hand in. This is only speculation though. And it's based on my memory which is, admittedly, shoddy.
Try the above out for yourself & see if it works for you.
..and of course, everything I've said above could be completely wrong...