I did do it. Dozens of people did on every server.

I am not pulling anything out of thin air. 37 transactions in one minute is a sample I gathered with my own hands and my own seals. I'm using math now because nobody is going to watch a 2-hour youtube of me sitting at an NPC counter, and I'm not wasting 50,000 seals for 50,000 gil to prove something no longer useful to anyone outside this thread.

The amount of time it takes to NPC drops is simply (<)2s per transaction times the number of stacks purchased. In the case of 12,000 seals, 8000 drops = 81 stacks. (<)2s x 81 = 162 seconds, or ~2.4 minutes. I already accounted for NPC transactions above:
So, actually, 2s per transaction is an over-estimation. It takes less than that. Altogether, it would take less than 25 minutes to convert 12,000 seals into 8000 drops into 1M gil.
25 minutes includes seal exchange as well as vendoring. And, I suppose, the trivial time it takes to teleport from the GC hall to the nearest vendor. Sorry if that was unclear.

The only thing I'm trying to do in this thread is dispute this guy's claim:
The reason this got so popular though is that even though the Gil-Per-hour with Atomos was actually less than more lucrative methods,
The truth is that there was no more lucrative activity than Atomos @ 12k seals/hour. Maybe people did get carpal tunnel or take a break while trading seals.

So what?

People take a break trading seals as much as they could take a break crafting or gathering or SBing or farming or doing leves or melding items or playing the market or buying gil or whatever you super-cool, anti-Atomos folks do to make so much money. Atomos, however, required no initial investment to profit, had 0 risk, instant return (no market ward delay), no taxation, and provably (actually and mathematically) generated gil at a rate faster than any other legitimate method in FFXIV as of September 2012 that I know of.

Even accounting for weary hands or break time in all other things, Atomos still makes more money. You cannot point to a single thing that makes 1M in liquid gil guaranteed every hour.

I'm at a loss of how I can make this any more persuasive. People really underestimate just how much of a gil fountain Atomos was, and that's unfortunate for everyone but, well, the people who played in the fountain.