QUOTE(monkeyemoness @ Jan 18 2017, 10:41 PM)

Ah, I guess I misunderstood. For some reason I was under the impression that you'll only get requests for certain motifs if you learned them. Turns out motif knowledge just changes the frequency of getting them. :V
Still, I wonder what that means for, say, a Woodworker. Would they get Master Writs at the same frequency as a Blacksmith with the same amount of achievements otherwise? Smithing has 11 chapters per motif associated with it as opposed to Woodworking's 3.
The notes say "associated with the skill" so I guess I can assume that the frequency is tweaked accordingly. Or maybe motifs only count towards the increased frequency if all chapters are learned? That would contradict the former statement, so maybe not.
I'm overthinking it now.
I don't think it has to do with achievements at all, but by skill level bought by skill points. But more than likely, you will get Writs you don't have the knowledge or stones to fill. I got one for Malacath style yesterday. In the real game, I would have no way of doing that Writ.
(on the PTS they give you the stones and knowledge if you start a new character - plus 10,000,000 in both gold and Telvar stones).
The Attunable Crafting Stations, the Target Skeleton (and a few other rare crafting recipes/plans), and the Ebony armor motifs are about the only thing you can get for doing those Master Writs. (plus the mats to make the target skeleton).
The Attunables are 250 each; all plans are 125 each; and the Ebony Armor is 25 each motif. The mats for making the skeleton are unique items, they are 8 and 35 per each stone. I don't know how many stones you need to make one.
Yesterday I did 12 Writs. The minority of them would have cost me a minimum of 8,000 each had I been buying the mats from a Guild Store; the majority of them would have cost me over 15,000 - 56,000 to make because they required Hakeijo (10,000 gold) ; Kuta (5,000 gold) ; or 8 gold tempers (minimum 7,000 each if buying from Guild Stores). And that isn't counting the Epic tempers; Rapora or Itade stones; etc. - which I need to check the price on.
The guy pays you only 300 gold for doing the writ regardless of what it cost you to make it, and then he gives you a random number of "Vouchers" toward the purchase of his wares. No extra gifts like mats to replenish your supply, etc. (like the regular Writs give).
Of those 12 Writs I did, 6 of them gave me only 2 vouchers. One gave me 4 vouchers, two gave me 5 vouchers, 2 gave me 7 vouchers, and one gave me 9 vouchers.
That means after 12 Writs that would have cost me approximately 350,000 to make if I had to buy the tempers and rare runes - I've only received 3,600 in gold and 49 vouchers toward buying something from him = that won't even get me two of the Ebony motif books (they are 25 per each).
So, unless Zenimax is handing out the stones in the game like they are on the PTS, (which is very doubtful) - I don't see me wasting my time and money doing those Master Writs (unless after a bunch of complaining they revamp the system a bit so it is a bit fairer to the player). I've already complained to them in Bug Reports, and from what I hear there are many others on the official forums that are voicing their outrage that they are costing such ridiculous amounts and giving so little back.
But I will say this - if you have any mats, hang onto them like gold, because in a few weeks you will be able to sell them for HUGE amounts higher than they are selling right now!