It's incredibly simple: Assuming you can smelt and have an alchemist, simply smelt saronite, transmute titanium and transmute titansteel. The rest comes from the AH. Your costs are easy to calculate. I'll give you an example using prices from my realm
on a weekday is about 16g a stack, fires are usually about 19g, earths are usually about 3.5g, and shadow is about 7. Final cost: 61.5g. I can sell titansteel for about 75g some days.
OK, realistically that's only on the weekends if your competition is out of stock or busy. The nice part of selling titansteel is that it's mostly AFK work to makel however, it's a lot
of AFK work. On the weekends, most people like to, you know, actually play. Unless we're crazy enough to have purchased a second account just to do trade skills without costing us playtime, then we're going to be limited in how much of the stuff we can crank out in a week. Just look at the time costs: Transmuting three titanium takes 15 seconds, and smelting 20 saronite bars takes 30 seconds. Plus you have to buy all the base materials and run around emptying and refilling your bags.
As with any market that only has a single end product, your pricing and posting methods will be a large factor in your success. When you're pricing your titansteel, remember that there's a very hefty deposit cost. Personally, I list smallish batches for 12 hours; however, whenever I notice that the competition is running low, I'll blast out 50 bars or so. I wouldn't take that risk if I knew I'd be undercut right away, but when the conditions are right, I can make 750g profit in a night. If the crafting was true AFK time (as in time that didn't take me away from some other auctioneering task), it's very much worth it. One problem I run into periodically is campers who never list more than 12 bars with a short duration, but check the auction house (seemingly) 10 times a night. The best way to deal with these people is to either camp back (use the mobile app if you have to) or undercut until they lose interest or start buying you out.
Lastly, since there is a decently long turnaround on making new stock, this is one of those markets where you might be able to turn a quick profit overcutting
when the supply starts to thin, buying competitors' stock and listing it yourself.
As for stack size, I like to list them in singles and doubles simply because there's no one recipe that's more popular than all the others. I've sold stacks of 20 before at a good price, but that was right after the removal of the titanium transmute cooldown, and back then, mats were cheaper.
I like to think of titansteel as a saronite sink. Not that I've needed one for a few months, but every so often, I find way more saronite than I could ever conceivably prospect or use some other way, and this is a simply way to get rid of it for a decent profit. If the titansteel market is saturated, I'll also just sell titanium or saronite bars, but one of the nice things about titansteel is that there's so much consistent demand.
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