Patch day, and everybody is talking at once
Okay, so. Patch day. If you have ever sat in a capital city on one (and if you have not, you are missing a very specific kind of chaos) you know that nobody is actually doing anything. Everyone is standing around, mounts parked in a messy ring, typing “so what changed?” into chat as if the answer might arrive by magic. I love it. I would not admit that to my guild (they would never let me forget it), but I do.
Anyway. The topic of the hour is always gold. Who is stockpiling, who is dumping, who swears that herbs will be worth a fortune by Friday (they say this every week, bless them). I have been collecting the loudest theories for a while now, partly for fun and partly because a few of them turned out to be right, and I like being able to say “I told you” with receipts.
The gossip, roughly in order of volume
Theory one, delivered by a gnome who seems to live in the city square: “Everything is about to go up.” (Everything. Every item. All of it.) Nobody asks for details, because the details would ruin the drama. Theory two, from a quieter player who crafts for a living (and who I trust far more): “Wait a day, then look at what people actually list.” That one is boring, and it is also the one I follow.

Then there is the classic crowd, the people who treat each patch as a personal opportunity to reorganise their whole bank (I am in this group, sorry). We gather in the guild chat, list everything we are holding, and argue about which stacks to sell now and which to sit on until the dust settles. Somebody always forgets something in a bag (usually me, usually a pile of linen). It is almost a ritual by now.
Things people swear they will do tomorrow
Restock on potions (they will not). Visit the Auction House early (they will sleep in). Finally sort the guild bank (nobody has opened it since spring). I say this with love, because I do all three of these things on a rotation, and I have never once done them on the day I promised.
One more patch-day habit worth confessing: I keep a tiny list of “things I was sure of last time” and tick off which ones were wrong (it is a long list, and a humbling one). Last month I was certain that cloth would crash. It did nothing of the sort (the realm had other plans, as it usually does). Now I treat my own hunches as gossip too, only with a slightly nicer font.
The gold itself, and the shortcut people whisper about
Now, here is the bit that gets lowered voices in chat. Every so often, somebody wonders aloud whether it is worth the grind at all, or whether you can just skip ahead (a pause here, because opinions in my guild are loud and divided). A couple of folks I know have, at various points, decided to buy WoW Classic gold, usually to equip a new alt, afford a mount, or set up a bank character without spending three weeks on ore. Others (me included, most of the time) prefer to earn it and grumble about it, which is half the fun. Neither group is bothered by the other, as far as I can tell; the raid starts at the same hour for all of us.

It came up again after the last patch, when a friend (let us call her the Mage, because she is one) asked how people get started on a fresh realm. Half the replies were routes and professions, the other half were links. One of the links was Buy WoW Classic Gold, posted without commentary, and the conversation just carried on around it like a river around a rock. That is the usual pattern. Somebody mentions it, somebody else shrugs, and we go back to arguing about whether linen is worth carrying.
What I actually do on patch day
For the record (since you asked, or since I am going to tell you anyway), here is my boring routine. I log in, say hello (to nobody, mostly), check the mail (always full), and open the Auction House. I do not list anything for an hour. I just look. Which stacks are suddenly gone? Which are piling up? Which seller has quietly doubled their lot (and why)?
After that I wander the city for a bit, because the chat is better in person. Somebody is always selling something strange. Somebody is always trying to organise a dungeon (and failing). Somebody has just got a new mount (and is parked in front of the bank so we all see it).

Oh, and one last aside (I promise it is the last): if the city is too loud, step out to the edge of town, where the mount trainers stand, and read the chat from there. It is amazing how much quieter a theory sounds from fifty yards away.
So that is patch-day gossip, more or less: lots of noise, a little signal, and a quiet player somewhere in the middle who is right about everything. Find that person. Follow them. Then go and farm something while the rest of us argue.